Write to email@example.com.
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.
You can mark each of your requests with your own identifier. This identifier is returned as part of a delivery receipt (DLR) callback.