Pay Invoice From Wallet

Pays an invoice using wallet balance. Required body fields: `invoice` invoice number, `currency` code. Optional depending on payment flow: `cloneId`, `partPaymentFromWalletBalance` object. Response fields: `message`, `invoiceNo`, `amount`, `walletBalance`. Possible errors: - 404: Invoice not found - invoice number does not belong to the customer. - 404: User not found - authenticated customer was not found downstream. - 404: Currency not found - supplied currency code is unknown. - 400: Currency does not match expected credentials - invoice currency differs from request. - 400: Wallet not found - customer wallet is missing. - 400: Customer Invoice does not match expected credentials - invoice belongs to another customer. - 400: Invoice already paid - invoice status is already paid. - 400: Wrong Amount - invoice payable amount is invalid. - 400: Insufficient funds - wallet balance cannot cover the invoice. - 400: Missing One or More Required Parameters - required body/query fields were not supplied. - 401: Unauthorized - token is missing, expired, invalid, or the account/token pair was not found. - 403: Access denied - gateway traffic guard/rate policy blocked the request. - 429: Too many requests - gateway rate limit exceeded. - 500: Unexpected Error - unhandled gateway or downstream service failure.