Since the VISA API seems of interest, MasterCard also has one. I wrote about a particular use case for these APIs, and other commercial ones, in a blog post [1].
TLDR: You need to be a "verified partner" or be sponsored to use VISA or MasterCard APIs.
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[ 2.9 ms ] story [ 9.7 ms ] threadTLDR: You need to be a "verified partner" or be sponsored to use VISA or MasterCard APIs.
[1] https://ksred.me/post/a-deeper-look-at-integrating-payments/