61006: Add-ons: Add-ons unavailable for GET callbacks

This warning appears when you use a Twilio Marketplace Add-on with an incoming Messaging or Voice webhook that is configured to send GET requests. Twilio does not include Add-on results in GET callbacks because URL length constraints can prevent the AddOns payload from being delivered.

• Your incoming Messaging webhook is configured to use GET. Add-on results for Programmable SMS are only included in POST callbacks.
• Your incoming Voice webhook is configured to use GET. Add-on results for Programmable Voice calls are only included in POST callbacks.
• Your application expects the AddOns parameter in the callback even though the request method is GET. Twilio omits that data from GET callbacks for these Add-on usage points.

• Change the incoming webhook method to POST for the Messaging or Voice flow that invokes the Add-on. Twilio supports both GET and POST for these webhooks, and POST is required when you need Add-on results in the callback.
• Update your application to read Add-on results from the AddOns parameter in the POST request body after you switch the webhook method.
• If you need GET for caching static TwiML or webhook responses, do not rely on Add-on data in that callback. Use POST for the endpoint that must receive Add-on results.

• How to Use Marketplace Listings
• Messaging Webhooks
• Voice Webhooks