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One archetype-D (async mobile-money) gateway. Unlike archetype C (hosted-webview), there is no synchronous UI at all — the user confirms on their phone (SMS/USSD/STK push) outside the app, so MobileMoneyGateway.pay() never launches anything; it just returns Pending and lets the orchestrator's existing poll-with-backoff (already built for UPI intent's SUBMITTED limbo) find out what happened.
Archetype-D: no SDK, no WebView, no UI at all in pay() — mobile-money confirmation happens on the payer's phone outside this app (an STK push / SMS / USSD prompt), so all this gateway does is kick off the mock delayed-flip (POST /mock/momo/{id}) and return Pending immediately. A poll- with-backoff on the consumer side picks up the result once its backend flips it.