Get a customer

curl --request GET \
  --url https://dev.flextell.ai/api/v1/customers/{id} \
  --header 'Authorization: Bearer <token>'

{
  "success": "<string>",
  "data": {
    "id": 123,
    "first_name": "<string>",
    "last_name": "<string>",
    "phone_number": "<string>",
    "email": "<string>",
    "date_of_birth": "2023-11-07T05:31:56Z",
    "gender": "male",
    "country_name": "<string>",
    "identity_number": "<string>",
    "job": "<string>",
    "address": "<string>",
    "default_channel_id": 123,
    "avatar_url": "<string>",
    "related_user": {
      "id": 123,
      "name": "<string>"
    },
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "deleted_at": "2023-11-07T05:31:56Z"
  }
}