Confirm one payment with the provider now

Confirms one execution-credit payment or saved-payment-method setup now, typically when the customer returns from hosted Checkout, instead of waiting for the provider's notification or the scheduled repair. It reads that one operation from the payment provider under the caller organization's authenticated account and applies what the provider reports: a paid Checkout grants its exact credit once, an open or unpaid one stays pending, and an operation already settled is answered without reading the provider. Nothing in the request can claim a payment succeeded — it names only which operation to read. Repeating the call is safe and converges on the same state. Returns the same execution-funding position as billing.funding.