unionpay - paymentcode

{
    "amount": "1.77",
    "currency": "SGD",
    "payment_method": {
        "type": "unionpay",
        "unionpay": {
            "flow": "qrcode",
            "is_present": true,
            "payment_code": "hQVDUFYwMWFWTwigAAADMwEBAlcRYmNhEZWREynSkGIBAAABiAFfNAEAYzOfJghWitG8Rb9QXp8nAYCfEBEHAAEDoAAAAQgwMDAwMDAwMZ82Ao9IggIAAJ83BHPyPJg="   
        }
    },
    "merchant_order_id": "{{$guid}}",
    "description": "acquiring sandbox testing",
    "metadata": {
        "request_id": "{{$guid}}"
    },
    "return_url": "https://127.0.0.1:8080/api/v1/callback"
}