GeneratePaymentContractPayload

{
    "amount": 0,
    "currency": "PHP",
    "description": "string",
    "deliverable": {
        "type": "order",
        "reference_id": "string",
        "description": "string",
        "details": "string"
    },
    "channel": "qrph",
    "expires_in": 600
}