Write to firstname.lastname@example.org.
Status Callback (POST)
A transaction callback looks like the JSON object displayed here. In additional_info, you must request mcc, mnc, price, and currency be included or they will be omitted in the response from TeleSign.
The reference ID for the transaction you want to find out the status for.
The customer-generated ID for this transaction that was provided in the original request. If the
external_id parameter was not included in the request, the value here is