Resume Payment Request - Recover an Interrupted Checkout via API

Re-open an existing hosted checkout when a customer closes their browser, loses the original payment link, or retries after the initial response is gone. BotSubscription checks the payment provider's current status first, so a payment that already completed always takes precedence over a stale checkout link—no second payment request is created.

The request body and query string must both be empty. A project or API-key token needs the payment-requests:add permission; a user token may only resume a payment request it owns.

reused: true means the returned payment_url points to the same checkout session—render it, don't start a new flow. When the provider reports the request as already paid or expired, the response instead reflects that terminal status rather than a stale URL.