curl --request GET \
  --url https://api.paytsoftware.com/v1/contacts \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "contact_identifier": "<string>",
      "call_phone_number": "<string>",
      "debtor_numbers": [
        "<string>"
      ],
      "default_email_address": "<string>",
      "firstname": "<string>",
      "gender": "<string>",
      "infix": "<string>",
      "invoice_email_address": "<string>",
      "invoice_cc_email_address": "<string>",
      "invoice_bcc_email_address": "<string>",
      "lastname": "<string>",
      "middlename": "<string>",
      "postal_address_street_1": "<string>",
      "postal_address_street_2": "<string>",
      "postal_address_postal_code": "<string>",
      "postal_address_city": "<string>",
      "postal_address_country_code": "<string>",
      "postal_address_region": "<string>",
      "prefix": "<string>",
      "reminder_email_address": "<string>",
      "reminder_cc_email_address": "<string>",
      "reminder_bcc_email_address": "<string>",
      "sms_phone_number": "<string>",
      "validation_errors": {},
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "pagination": {
    "cursor": "<string>"
  }
}