MoMo All-in-One Payment Gateway (AIO v2)
The MoMo All-in-One (AIO v2) merchant payment gateway. One integration covers MoMo e-wallet, domestic ATM card, credit card, Apple Pay, Google Pay, Buy Now Pay Later, Quick Pay POS scanner, collection links and static/dynamic QR acceptance, plus transaction query, two-step capture/cancel confirm, reverse and refund, tokenisation (account binding and subscription) and single/batch disbursement. All calls are POST JSON signed with HMAC-SHA256; results are pushed back over IPN.