PayMyBid, checkout for pay-to-rank boards

Field notes

The integration starts when a board posts an amount and its own reference, and PayMyBid returns a checkout link for the payer. Payment is handled on a hosted page described as using Stripe and supporting cards, Apple Pay, Google Pay, and Link. Instead of receiving callbacks, the board polls for order status; the page presents this as a way to avoid shared secrets, callback security, and forged paid events.