Create REST API Validator Groovy script

We need to create a scripted field in Jira that is able to check an API response and compare a specific value in the response against the value submitted by the customer in the field. For example: Custom string field (value stored as var1) REST API endpoint (var1 included in body of POST request) API response key value (value stored as var2) If var1=var2, customer submitted value is correct, allow submission of ticket if var1!=var2, return an error describing a comment (test comment for now) Attached is a working Groovy script with a POST request and body for parameters. We need to create the following for testing the new field test request type test custom field add new custom field to new test request type add / modify script to have the functionality described above create a ticket with test value (value1) screenshot the error response if another value is submitted (value2 for example)