curl --request POST \
  --url https://ecsend.paysgator.com/contacts/books/{name} \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "phoneNumber": "+25884xxxxxxx",
  "contactName": "John Doe"
}
'

{
  "success": true,
  "contact": {
    "phoneNumber": "+25884xxxxxxx",
    "name": "John Doe"
  }
}