{
"account_bank": "044",
"account_number": "0690000040",
"amount": 5500,
"narration": "Akhlm Pstmn Trnsfr xx007",
"currency": "NGN",
"reference": "YOUR_PAYMENT_REFERENCE",
"callback_url": "https://www.flutterwave.com/ng/",
"debit_currency": "NGN",
+ "debit_subaccount": "PSAFF2118D1A33844332"
}
kindly explain the call back URL and the payload its sending? is it a post or get endpoint?