> In total these companies have profit in double digit billions If you think about it. Stripe, Block, PayPal only exist because of credit card networks (Visa, Mastercard, American Express, JCB, Discover) and issuing banks (JPM, WF, BoA, foreign banks). Those last two groups of entities have such terrible integrations/interfaces and fail to improve due to their oligopoly on the entire process of facilitating buyer and…
As a result, the American Express API is actually decent[0].
[0]: https://gateway-na.americanexpress.com/api/documentation/int...