Paypal api recurring payments perl työt

I'm in need of a seasoned expert in WooCommerce and specifically Dokan plugin assistance. My project req...marketplace operates seamlessly. - Thorough set up of the WooCommerce shopping cart, ensuring an intuitive and user-friendly process for my customers. - Detailed arrangement of payment methods, primarily focusing on integrating PayPal into my platform for smooth and secure transactions. - Effective set up of products and categories, for a well-structured and easily navigable marketplace. Ideal collaborators should be well-versed in the mentioned plugins and skilled in creating efficient, streamlined shopping experiences. Proven experience with rental marketplaces and PayPal integrations would be highly advantageous. Please, attention to detail and a customer-centri...

...executable and perform startup tests to ensure its stability. Design a rollback mechanism to revert to the previous stable version if the new version fails at startup. Incorporate signature verification for each new executable to maintain security and authenticity. Enable the ability for periodic automatic updates and the ability to turn automatic updates off. Expose your program to a REST api so that it can be operated and monitored from a local HTML Run the program as a SYSTEMD service on boot and monitor it's status Preferably use pre-existing open-source Golang libraries to achieve these objectives, ensuring that the solution is both efficient and reliable. There are several that accomplish the above tasks e.g. Requirements: Proven

...bot that leverages the Solana Scan Pro API for identifying and capitalizing on price differences between tokens across both decentralized and centralized exchanges. Key Features: - Arbitrage Opportunities: The bot should be specifically designed to scan and identify price differences between specified base and trade mints. - Cross-exchange Monitoring: It should be able to monitor both decentralized exchanges (DEXs) and centralized exchanges (CEXs) to maximize the range of opportunities it can identify. - Automated Trading: Once an arbitrage opportunity is detected, the bot should automatically execute trades without the need for manual confirmation. Ideal Skills and Experience: - Proficient in Solana: As the bot will be using the Solana Scan Pro API, experience with Sol...

Step by Step Process to Host Asp.Net Web-Api Project into Docker Container. In both Windows & Linux. Explain with Sample Project. with all commands. Feel free to message me with your experience in these areas, and your availability to begin work. Thank you!

I'm seeking an experienced C# developer to port a python webapp app to a C# web app (most likely ASP .NET with RazorPages). There is no database, all the data comes from an existing API. Key Skills & Experience Required: - understanding the fastapi + jinja templates (python based) - Hands-on experience in developing RESTful APIs using C# - simple and clean code - data serialisation The entire app has 100 lines of code + ca 100 lines of HTML template There are 3 buttons and about 6 endpoints Task: GIVEN: A simple webapp in python (fastapi + jinja) RESULT: - A webapp with the same functionality based on C# - it should be easy to understand / clean code - data serialisation as in the python app / template - short documentation (dependencies/install/deploy) Only ap...

Note : my budget not more 10$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : Maybe this explanation more clearly: **Game Objective:** The goal is to create a web-based multiplayer game where each player receives secret tasks from an AI. These tasks must be completed to progress towards a common goal. The game is dynamic, with scenarios and tasks changing based on player actions. **Step-by-Step Process:** 1. **Player Registration and Friend Network:** - Players sign up and add friends within the game to form a network. - Each player is assigned a unique identifier for tracking purposes. 2. **Hidden Scenario Generation:** - At the beginning of each game session, the AI generates a hidden scenario that...

Shopify website for Fashion- cosmetic products Users can register, login, buy products, can make online payments Admin- Shopify features to manage the website

1 API fixing issue. 2 button issues. Able to work with ftp and start immediately

I urgently need a Laravel developer who can help upgrade Laravel in my existing project. Speed is of the essence in this project, as I need it completed as soon as possible. Skills and Experience: - Expertise in Laravel development - Experience in API integration - Prior experience in upgrading Laravel versions - Ability to deliver quality work under tight deadlines Please, only serious and committed Laravel developers should apply. I look forward to your prompt responses. Thank you.

I need an experienced engineer in Jasmin SMS gateway. We have Jasmin ready on our server, we need to handle all MT/MO messages in our endpoint/database, we already handle all MT messages via our interceptor script. Problem: we need to handle message statuses too Task: Provide a Python script to handle message s...experienced engineer in Jasmin SMS gateway. We have Jasmin ready on our server, we need to handle all MT/MO messages in our endpoint/database, we already handle all MT messages via our interceptor script. Problem: we need to handle message statuses too Task: Provide a Python script to handle message statuses, and demonstrate that it works! Important! We know that is it possible to get DLR via http API, our users use smpp only for now, we need to handle messages from both...

I need an experienced engineer in Jasmin SMS gateway. We have Jasmin ready on our server, we need to handle all MT/MO messages in our endpoint/database, we already handle all MT...experienced engineer in Jasmin SMS gateway. We have Jasmin ready on our server, we need to handle all MT/MO messages in our endpoint/database, we already handle all MT messages via our interceptor script. Problem: we need to handle message statuses too Task: Provide a Python script to handle message statuses, and demonstrate that it works! Important! We know that is it possible to get DLR via http API, our users use smpp only for now, we need to handle messages from both http/smpp. helpful links:

I am looking for an experienced Python developer to create a scraper for Lazada. The ideal candidate must be skilled in web scraping and should reverse engineer API from mobile app because lazada blocks and throws captcha on web website is lazada . The script should work like i enter something in search box and it should scrape all the products from that search query Key Responsibilities: - Extract the following information: product names, prices, descriptions, stock, images, seller information, and product URLs. This list encapsulates the attributes you need to pay the most attention to. - Organizing the scraped data: The data, once scraped, must be organized in a well-structured CSV file. Ideal Skills: - Strong experience with Python. - Proficiency in web scraping tools. -...

Source code: Compile it and run all the apis on your machine , if there is any api issue , give me estimate time and budget to fix it. More details: What specific tasks do you need the Node developer to perform? Backend development Which backend frameworks are required for this project? Node Are there any specific features or functionalities that you would like the backend to have? I will mention

Se tiene una plataforma creada en Retool y es necesario crear un mecanismo que integre vía API a MercadoLibre y así extraer los datos a una Base de Datos en PostgreSQL. Storytelling: Un usuario entra a nuestra plataforma, encontrará un botón que indique "Vincular cuenta de MercadoLibre" al dar click deberá de ingresar a su cuenta de MercadoLibre y mostrará una página pidiendo autorización para la integración. Una ves aceptada, se tendrá un proceso de descarga de datos a una base de datos y la plataforma mostrará una serie de reportes basados en dichos datos.

...would also assist in the development of a fintech API with specific features. Key Project Details: - Content Writing: The role would involve producing engaging, informative content specifically around the topic of fintech API, Payment processing, and software development. - API Development: The ideal candidate would be a skilled developer with experience in fintech API. Key features would include real-time data integration, payment processing, and user authentication. Payment Processing System Requirements: - Ability to accept multiple payment methods - Secure encryption for sensitive data - Integration with popular payment gateways Ideal Skills and Experience: - Proven experience in content writing on fintech topics. - Proficiency in fintech API d...

I'm in need of an experienced React Developer to develop a webapp for my project. Should be able to implement user authentication, responsive design, and integration with third-party APIs into my project. A key authentication functionality is Whatsapp OTP based login. Ideally, you're versed in creating a bold and colorful layout that pops. I value cle...develop a webapp for my project. Should be able to implement user authentication, responsive design, and integration with third-party APIs into my project. A key authentication functionality is Whatsapp OTP based login. Ideally, you're versed in creating a bold and colorful layout that pops. I value clean code and innovative solutions. Strong knowledge of React and previous experience with Whatsapp API are essential. L...

I need a skilled PHP developer to write a script that will interact with an API and retrieve User Information and Product Details. The fetched data should then be displayed in HTML format, enabling users to search through it. Key Requirements: - Fetch User Information and Product Details from an API - Print the fetched details in HTML format - Implement a search function to enable user interaction Ideal Skillset: - Proficiency in PHP - Experience with fetching and handling data from APIs - Strong understanding of HTML and web interface design - Prior experience implementing search functions in web applications Please provide examples of your previous work with APIs and user search functions.

I'm looking for an experienced credit repair specialist to help me resolve my credit issues. Key Points: - Issues: Specifically, I'm trying to address late payments and collections on my credit report. - Previous Attempts: I've previously used credit repair services, with limited success. - Expectations: My primary goal is to improve my credit score. Ideal Candidate: - Proven Track Record: I'm looking for someone with a strong track record of successfully resolving late payment and collection issues for clients. - Industry Knowledge: A comprehensive understanding of credit repair laws and regulations is a must. - Communication Skills: I want to be kept informed throughout the process, so strong communication skills are essential. - Transparency: An open and tr...

I am seeking an experienced Laravel developer to perform various back-end functio...various back-end functionality customizations for my projects, with a focus on payment processing. Key Responsibilities: - Customizing the back-end functionality of my Laravel project. - Integrating Payment Processing system. Skills and Experience: - Proven experience with Laravel - Extensive understanding of back-end development - Expertise in payment processing systems - Familiarity with API integration and database management. The ideal candidate should have a deep understanding of Laravel and be comfortable with all aspects of back-end functionality. I'm looking forward to seeing how you can help tailor my project's capabilities to our needs, particularly in regards to payment pro...

I'm looking for a talented web developer with a passion for fitness to help build an e-commerce website fo...cart and secure checkout process. - Customer Reviews: I'd like to enable customers to leave reviews on the products they've purchased, as this can greatly enhance the credibility of our brand. Payment Methods: - PayPal: Integration with PayPal is essential for providing a secure and widely used payment gateway. - Cash on Delivery: The option to pay for orders on delivery is a must, to cater to a variety of customer preferences. Ideal Skills: - Web design and development - E-commerce website building experience - User interface and user experience design (UI/UX) - Knowledge of PayPal integration - A background or strong interest in fitness, gym ...

I'm looking for someone who is smart and can record some action songs for preschool kids. No previous experience is required. You can just use your phone camera to record the videos. You only have to act/dance based on the songs we provide. You will get the payments for each video song you record. We will provide you with all the reference songs for each video. It's just 3-5 minute long videos and it depends on the song. Please take a look at the example video (This is just a demo video and the rhymes will be mostly in English.) ============ ============ ============ ==== ============ ============ ============ ====

...developer to complete my marketplace website. The HTML and CSS are ready, and now I require the backend coding to be developed with respective API integrations. Key Functionalities: - User Authentication and Registration: Users should be able to securely sign up and log in to the website. - Product Listing and Search: A seamless system for users to add, search and interact with products. - Payment Processing: Smooth integration of payment gateways to ensure secure transactions. Key Requirements: - Backend Coding: Looking for a professional who can develop the entire backend system from scratch. - Python Proficiency: The backend should be built in Python. - API Integration: In addition to payment gateways, I also require the integration of social media login and a bookin...

As a small business owner, I am seeking a design-savvy freelancer to develop an engaging ecommerce website for my store, which sells undisclosed products....products. The project encompasses: a) Website Design: - A functional and user-friendly interface that suits my brand and attracts customers. I need advice on making the most effective color choices to enhance the user experience. b) Payment Integration: - The comfort and convenience of my customers is a top priority, so the integration of multiple payment methods, namely Credit/Debit Cards and PayPal is non-negotiable. Desired Freelancer Skills/Experience: - Web development - Payment gateway integration - Solid understanding of color psychology and its role in UX design - Prior experience in e-commerce sites would be adv...

I will integrate the cities API in dropdown with property numbers too and will customize the design to have a better look.

I'm in need of a competent and highly creative graphic designer with extensive experience in designing visually captivating social media posts. Key Res...message and aesthetics - Ability to meet deadlines is paramount as these creatives are needed daily Ideal Candidate: - Extensive experience in graphic and social media design - Fluent in tools such as Adobe Photoshop, Illustrator, etc. - An excellent understanding of the features and requirements for graphics on various social media platforms, specifically Facebook and Instagram. This is a recurring project that requires consistent delivery of high-quality graphics, therefore a suitable candidate should be ready for a long-term commitment. Should the quality of work be satisfactory, the project length and remuneration ca...

...interface that deals with the API of a website I have a subscription and membership to The site provides an API for my account and can be integrated with an interface to operate through it This is to import my templates and tools into and display them on my site Anyone submitting an offer is requested to review the website and information to learn how to deal with the API The application interface is required to display and call up forms to display through my site in a private chat window from here can read about Api Note: I have some websites and application html templates that the programmer can use as a ready-made template. Just programming and api integration with these templates

UI is done, Login, Product, Stock, Order api only. Flutter

...calendar are automatically reflected in my Apple Calendar. This includes changes to event times, dates, and any deletions. Specifically, the sync should prioritize the following types of events and details: - All-day events: These should be correctly represented in my Apple Calendar. - Meetings with attachments: The sync should ensure that the attachments are accessible in my Apple Calendar. - Recurring appointments: These should be correctly synced, avoiding any overlap or duplication in the Apple Calendar. As the sync is one-way, the Apple Calendar will not be sending changes back to the Outlook calendar. I'm looking for a solution that is reliable and operates seamlessly in the background. The ideal freelancer for this project will have a thorough understanding of both ...

...their local MP. The page will show MPs. Users can use the filter option to view the MPs of any city. From there, users can view the contact information of the MP. Reference: All these details regarding the above Turkish businesses will be pulled from the Google Maps API. This data flow should occur at least weekly. The data that will be pulled is detailed out in the Development & Technical section. If this cannot be pulled from the Google API, the software developer will refresh the data from Google Maps and relevant online sources every month for the next 12 months post-release. The complete design of the product, including UI/UX design, will be supported by the software developer. Details of the project can be found attached. Looking forward to

Necesito una plataforma donde reciba datos de formularios, que guarde esos datos que pueden ...datos de formularios, que guarde esos datos que pueden ser con campos variables (nombre, telefono o nombre, email,telefono) por ejemplo y que esos datos los guarde en una base de datos, dentro de la plataforma se tendrian que guardar en eventos diferentes en tablas separadas por tipo de formulario, con esos datos se utilizaria los numeros de telefono para enviar mensajes por whatsapp mediante un api, asi tambien que se tenga una funcionalidad de programar el envio de mensajes por fecha a algunos o a todos los registros de una tabla, la plataforma debe contar con un usuario de tipo administrador. Adicionalmente tambien se pueden cargar los registros desde la misma plataforma o por un archiv...

Unicenta POS - Payment Module Integration with Tyro card payment. Access to Tyro and Custom Unicenta POS source code will be provided. Tyro - Integration Features - Integrated Purchases - Integrated Receipts - Integrated Refunds - Integrated Split Payments - Integrated Surcharging Disable Sales Screen - buttons Cash, Debt, Card, Refund Add - Counter (field) in Configuration - General Testing, Debugging, Fix Issue and Deliver the Project in Working Condition.

I'm looking for a skilled developer to aid in setting up game APIs on my website. Specifically, I'm interested in incorporating betting games. Here are a few specifics maintaining to the project: - Skills and Experience: The developer should understand how to integrate APIs, preferably someone with a background in gaming, and has a clear concept on user interface. Experience with betting games APIs will surely set you apart. - Games: Although I was reluctant on ticking a few boxes, I'm particularly interested in integrating betting games into the site. If you have selections or demos to propose, please don't hold back. The more ideas, the better! - Features: Although I skipped the features question, any suggestions you might have regarding user authentication, leader...

...replace them with the APIs 1- Make code debuggable. 2- Error message appear with no details, need to make the error message has Show More to display the details of the error. 3- Load Codes from APIs instead of loading from JSON file. (1 API) require updating treeview to load on demand 4- Packages Load from APIs instead of loading from DB (2 APIs) 5- SubscribedPackages Call API instead of inserting into a DB (1 API) 6- Schemes Load from APIs instead of loading from DB (1 API) 7- Uploads Call API instead of inserting into a DB (1 API) 8- Users Call API instead of inserting and reading from a DB (5 APIs) you must have C# Blazor experience. Project Code : -------------------------------------------------------------------------...

I'm looking for a talented Power BI expert to create an interactive interface. The main requirements are: - Developing a Power BI interface where users can input an ID. - Calling a specific REST API using this ID (which requires authentication). - The hierarchical data received should be processed and transformed appropriately for display in a Power BI matrix. - The interface should offer intermediate levels of interactivity, such as drill-downs and data exploration. Ideal Skills and Experience: - Proficiency in Power BI. - Experience working with REST APIs, including handling authentication. - Strong understanding of hierarchical data structures. - Ability to process and transform data within Power BI. - Prior experience creating interactive and exploratory interfaces.] - Al...

... Specific Requirements: Can develop and create a System/Plugin, or a ready-made System/Plugin that can connect to our SPM word press system that can handle the following: - Automatic comparing and suggesting freight prices with multiple couriers - Reduce time to generate consignments - Real Time tracking for all couriers in a single screen - Connect to all Australian Courier's API that we are currently using - Can ADD, UPDATE, and DELETE couriers - Manually printing of consignment Labels - Similar in functions to software's like Machship and the like Additional Requirements: - Proficiency on responsiveness of the theme and cross-browser compatibility. - Attention to detail and ability to follow a detailed plan. - Very responsive and able f...

I'm in need of an expert in Xero for my recruitment business. What I need: - Complete Setup: I need my Xero account set up from scratch for my business - Essential Features: Prioritize Invoicing and payments, Expense tracking, Payroll management, and Inventory tracking. Ideal Skillset: - Extensive Xero Experience: Proven track record with Xero for businesses, especially in the recruitment industry. - In-depth Knowledge: A clear understanding of Xero's functionalities, especially those relevant to my business needs. - Customization Expertise: Ability to tailor Xero to meet the specific needs of a recruitment business. - Time Efficiency: I'm looking for someone who can complete this setup promptly and accurately. Please provide a summary of your Xero experience in...

I am in need of a skilled app developer to create a bespoke CRM mobile software that's user-friendly and appealing. This app w...File attachment: Incorporating a feature to allow file sharing. - Push notifications: To keep users updated. Moreover, the application will include a Subscription Services feature for monthly recurring payments. Lastly, it will need a Referral Tracking feature. The tracking should be capable of determining the source of each referral. The ultimate developer for this project will possess strong experience in IOS and Android app development, especially with CRM applications. Superior knowledge of databases, UI/UX design and notification systems is crucial. Experience in implementing subscription payments and source-based referral tracki...

Note : my budget not more 50$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : Maybe this explanation more clearly: **Game Objective:** The goal is to create a web-based multiplayer game where each player receives secret tasks from an AI. These tasks must be completed to progress towards a common goal. The game is dynamic, with scenarios and tasks changing based on player actions. **Step-by-Step Process:** 1. **Player Registration and Friend Network:** - Players sign up and add friends within the game to form a network. - Each player is assigned a unique identifier for tracking purposes. 2. **Hidden Scenario Generation:** - At the beginning of each game session, the AI generates a hidden scenario that...

...professional, yet user-friendly e-commerce website developed using Magento open source, integrated with a mobile application built with Kotlin for Android and Swift for iOS. Key Aspects: - The main goal of this website and app is to sell physical products such as clothing, electronics and accessories online. - Both platforms must accept a variety of payment methods, including credit cards and PayPal, while also offering a cash on delivery option. Ideal Freelancer: - Extensive experience with Magento open source for e-commerce websites. - Proven proficiency in Kotlin for Android and Swift for iOS mobile app development. - Familiarity with incorporating diverse payment gateways. Your bid should clearly outline estimated timelines, proposed solutions and similar projects comple...

Note : my budget not more 10$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : Maybe this explanation more clearly: **Game Objective:** The goal is to create a web-based multiplayer game where each player receives secret tasks from an AI. These tasks must be completed to progress towards a common goal. The game is dynamic, with scenarios and tasks changing based on player actions. **Step-by-Step Process:** 1. **Player Registration and Friend Network:** - Players sign up and add friends within the game to form a network. - Each player is assigned a unique identifier for tracking purposes. 2. **Hidden Scenario Generation:** - At the beginning of each game session, the AI generates a hidden scenario that...

I'm s...function will be to facilitate online sales. The key features I'm looking for include: - **E-commerce Functionality**: The website should be optimally designed for product showcasing and seamless online transactions. - **Payment Gateway Integration**: I require the setup of PayPal, as the preferred payment gateway for secure transactions. Ideal candidates for this project should possess: - Proven experience in e-commerce website development, particularly in product sales. - Strong familiarity with integrating PayPal payment gateway. - A keen eye for user experience and design to ensure an easy and enjoyable shopping experience for customers. I'm looking forward to working with a reliable and skillful professional who can bring my vision for Piggy...

...transactional email footer should uncheck the subscribe mark in user's account.  8.  Confirming subscription in the user's inbox with the transactional email should auto login to the user's account and show message "You are now Subscribed" or "Thank you for Subscribing" in user's dashboard. ::  User should then get the Subscribed Transactional Email.  9.  Fedex shipping rate does not show despite api and secret code are entered.  10.  Shipping Tracking plugin not working  11.  Logged user out of account after 15 minutes of inactivity.   12.  For a new user, after confirming registration, when the 1st product is added to cart, it does not add to cart, user sees a...

It is to create three timplementations of a place-and draw using the API proveded in ur5_interface.

Note : my budget not more 10$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : The idea is to create a web application that integrates ChatGPT API and a custom model. The functionalities include generating scenarios using ChatGPT API and then distributing tasks to users based on the scenario and their profiles or needs. For example, let's say the chatbot has users A, B, C, and D. The system selects which user to assign a task to based on their profile or needs. If the task is assigned to user B, they perform the task. If user B accepts the task, the system may assign a task to user A next. If user B declines, the system may change the scenario or assign the task to users C or D. In essence, use...

I'm in need of a sophisticat...Document Interaction: • Extract information from PDF, Excel and Word files • Provide document descriptions that enable efficient and informative interactions Graph Generation: • Generate graphical representations from data extracts • Capable of creating bar charts, pie charts, and line graphs Desirable Skills & Experience: • Expertise in Django is a must • A good understanding and experience of GT4 API • Knowledge of ORM and DRF • Familiarity with data visualization may come in handy To recap, I'm seeking a Django chatbot that is able to interact with various document types, provide descriptions based on the documents uploaded, and generate different types of graphical data-based representations...

I'm seeking an experienced freelancer to debug and build my GitHub actions for 2 of my Android Java projects. The main task involves using building variants of my android application for the "development", "staging", and "production" environments which will all have separate API endpoints, package names, and app icons. Experienced Android Java programmers with a solid understanding of GitHub action builds, API implementation, and flexible design skills will be the ideal fit for this project.

I need a crisp, clean and minimalistic website for my tourist farm which will provide users the ability to book and pay online. Key functionalities: - sending inquieres from possible dates - User Interactivity: The visitors should have the ability to leave reviews and ratings for their stay, encouraging interaction and sharing of experiences. Payment Setup: - no payments, just inquiries Ideal Skills: - Web Design - Payment Gateway Integration - Calendar Management - Review and Rating System Integration Prior experience with similar projects would be beneficial. I'm interested in a developer who understands minimalistic design and can successfully integrate the specified functionalities.

Note : my budget not more 15$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : The idea is to create a web application that integrates ChatGPT API and a custom model. The functionalities include generating scenarios using ChatGPT API and then distributing tasks to users based on the scenario and their profiles or needs. For example, let's say the chatbot has users A, B, C, and D. The system selects which user to assign a task to based on their profile or needs. If the task is assigned to user B, they perform the task. If user B accepts the task, the system may assign a task to user A next. If user B declines, the system may change the scenario or assign the task to users C or D. In essence, use...

...accurately and quickly In terms of functionality, the application should be able to: - Monitor Instagram messages and comments in real-time - Set up a webhook to receive Instagram data - Reply automatically to the messages received using OpenAI Assistant Ideal skills and experience for this project include: - Proficiency in TypeScript and SaaS architecture - Experience integrating with Instagram's API - Familiarity with chatgpt or similar AI tools - Background in setting up webhooks for data reception A strong understanding of user authentication, authorization, and dashboard interfaces would also be beneficial. This will empower our users to manage their data and interactions efficiently. Anticipate a dynamic project that will require meticulous attention to detail, cr...

Note : my budget not more 30$ for whole project Create web app based on chatgpt API and custom model . With frontend and backend Requirements : The idea is to create a web application that integrates ChatGPT API and a custom model. The functionalities include generating scenarios using ChatGPT API and then distributing tasks to users based on the scenario and their profiles or needs. For example, let's say the chatbot has users A, B, C, and D. The system selects which user to assign a task to based on their profile or needs. If the task is assigned to user B, they perform the task. If user B accepts the task, the system may assign a task to user A next. If user B declines, the system may change the scenario or assign the task to users C or D. In essence, use...