All new Flowroute customers will be interacting with the Messaging v2.1 by default.
For existing customers who are using the Messaging API v2, opting into v2.1 is fairly straightforward. If you're wondering or hesitating, here are some good reasons to upgrade to v2.1:
Ability to send and receive MMS messages
Embedded delivery receipt information for outbound SMS
Ability to configure separate callback URLs for SMS and MMS
Ability to send compact and JSON API requests
To get started with the upgrade
Log in to your Flowroute account.
Visit Preferences > API Control to update your SMS or MMS settings.
Select v2.1 in the SMS Format drop-down list and click Save.
Reverting to v2 is currently not an option.
While you can still hit any of the v2 messages endpoint, your Message Detail Records (MDRs) will be rendered in the v2.1 format with embedded delivery receipt information for every outbound SMS that you send.
If you want to take advantage of Flowroute's MMS Callback service, configure your Callback URL with this article.
Enabling MMS will add new attributes from v2.1 to your inbound SMS message detail records (MDRs) as shown below: