Create a new voucher payment

curl --request POST \
  --url https://staging-vouchers.ventogram.com/api/v1/vouchers \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Api-User: <api-key>' \
  --data '{
  "email": "<string>",
  "fullname": "<string>",
  "amount": 123,
  "currency": "NGN",
  "rateKey": "<string>"
}'

{
  "success": true,
  "message": "<string>",
  "data": {
    "id": "<string>"
  }
}