Bid only if you have implemented BHIM / UPI payment in Magento 2 successfully. Customers buy items on Magento, then we present BHIM Pay / UPI pay instructions. Customer verify payment and then we ship products.
Only Bid if you have done this. I don't want to hear I can do this very easily comments.
Mention only BHIM / UPI and not other projects, if you do that, your bid will be ignored because it is generic proposal.