curl --request POST \
  --url https://dev.users.niobi.co/api/v4/niobi-unified-payments \
  --header 'Content-Type: application/json' \
  --data '{
  "client_id": "K1PoY1WYricSpXh6Wm24twnk6ecPJOWrHGsqiKJr",
  "params": {
    "amount": 1000,
    "customer_identifier": 1234,
    "currency": "KES",
    "payment_reference": "TRANS-123456789",
    "first_name": "John",
    "last_name": "Doe",
    "mobile": "254123456789",
    "email": "john@doe.com",
    "country_id": "1",
    "city": "Nairobi",
    "postal_code": "001001",
    "line1": "abc, xyz",
    "description": "abc, xyz",
    "client_callback_url": "https://your-domain.com/niobi/result",
    "third_party_reference_1": "<string>",
    "third_party_reference_2": "<string>",
    "payment_method_type": "send money",
    "mtn": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Orange": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Vodacom": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Airtel": [
      {
        "phone_number": "254123456789"
      }
    ],
    "at": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Vodafone": [
      {
        "phone_number": "254123456789"
      }
    ],
    "tnm": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Zamtel": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Halotel": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Tigo": [
      {
        "phone_number": "254123456789"
      }
    ],
    "Free": [
      {
        "phone_number": "254123456789"
      }
    ],
    "sendmoney": [
      {
        "phone_number": "254123456789"
      }
    ],
    "paybill": [
      {
        "paybill_number": "123456",
        "account_number": "123456789"
      }
    ],
    "tillnumber": [
      {
        "till_number": "123456"
      }
    ],
    "pesalink": [
      {
        "bank_name": "ABC",
        "bank_code": "00",
        "branch_name": "ABC",
        "account_name": "ABC",
        "account_number": "123456789"
      }
    ]
  },
  "salt": "justrandomstring",
  "sender": "John.co",
  "timestamp": 1709363033,
  "signature": "2193d01d50d4bd5da234ac0e0add5d4ccb40907a1b1ab27a12d2c1d88a5d5807"
}'

{
  "success": "true",
  "message": "Payment process initiated successfully.",
  "data": "",
  "res": ""
}