curl --request POST \
  --url https://api.assistable.ai/v2/ghl/make-call \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "number_pool_id": "<string>",
  "assistant_id": "<string>",
  "location_id": "<string>",
  "contact_id": "<string>"
}'

{
  "success": true,
  "call_id": "<string>",
  "returned_an_error": true,
  "error_message": "<string>",
  "error_code": 123
}