curl --request POST \
  --url https://dev.users.niobi.co/api/v3/niobi-unified-collections \
  --header 'Content-Type: application/json' \
  --data '{
  "client_id": "<string>",
  "sender": "<string>",
  "timestamp": 123,
  "salt": "<string>",
  "signature": "<string>",
  "params": {
    "amount": 123,
    "mobile": "<string>",
    "country_id": 123,
    "currency": "<string>",
    "payment_method_type": "<string>",
    "callback_url": "<string>",
    "third_party_reference_1": "<string>",
    "third_party_reference_2": "<string>"
  }
}'

{
  "success": true,
  "message": "Verification token was sent to your mobile number. Kindly verify to proceed with payment.",
  "data": {}
}