Comma separated list of recipient phone numbers (maximum of 1000). Optionally append a session ID to each phone number separated by a colon.

The text of the message to your recipients.

A string specifying a use case code. Choices include -

• ATCK - for use in a 2FA situation like updating an account or logging in
• BACF - for creating an account where the service may be vulnerable to bulk attacks and fraudsters
• BACS - for creating an account where the service may be vulnerable to bulk attacks or individual spammers
• CHBK - for use when someone is trying to buy something expensive or unusual and you want to verify it is really them
• CLDR - calendar event
• LEAD - for use in a situation where you require a person to enter personal information in order to obtain information about something like a loan or realty or school, and you want to check if the person is bogus or not
• OTHR - if you have a situation not addressed by other tags
• PWRT - for use in a situation where a password reset is required
• RESV - for use when you have end users making reservations and not showing up, and you want to be able to include phone verification in the loop
• RXPF - for use when you are trying to prevent prescription fraud
• SHIP - for use when you are sending a shipping notification
• THEF - for use when you are trying to prevent an end user from deactivating or redirecting a phone number in order to take over someone else's identity
• TRVF - for use when you are transferring money and you want to check to see if it is approved by sending a text message or phone call to your end user. This is similar to CHBK, but is specifically for a money transaction
• UNKN - if you have a situation not addressed by other tags (same as OTHR)

The phone number from which to send these SMS messages.