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Infrastructure is only infrastructure if other people build on it without asking permission. The tension is that a completely open surface is also an abusable one, and resolving that badly in either direction is fatal.
Today an integration acts as an operator with that operator's own token. There is no self-service key issuance and no third-party app model, so building on this is possible and not yet frictionless.
Open access to a commerce surface attracts scraping, fake accounts and fraud attempts. Rate limits, verification levels and per-actor authorisation are what make openness survivable rather than aspirational.
Access to what an operator can already reach, granted by that operator, revocable by them, and attributed in the log. Anything that gives a third party more than the operator it acts for is a privilege escalation.
Designed, not built. The API and its per-actor guards exist; a formal programme with self-service credentials and a review process does not.