Thanks. Answering your questions this is a custom implementation entirely based on AWS serverless stack + Braintree payment. Although in retrospective I would probably go with Shopify + custom plugin. Regarding Instagram approval I had no problems with getting approved. I may change now after Facebook replaced Instagram API with their own. However, we had a lot of problems getting prod approval from Braintree Payments. It took me over 1 month to finally be able to process payments.