Error Handling in Twilio Verify’s SMS Service: A Challenge
Implementing Twilio Verify’s SMS Service
We’ve successfully implemented Twilio Verify’s SMS service, and it works 99% of the time. However, we recently encountered an issue where an SMS was unable to be delivered, resulting in error codes 30005 and 30006.
The Problem: Insufficient Error Handling
The problem is that these error codes are not returned in the response when the verification instance is first created. All we receive is a 201 status and a pending status. This makes it challenging to build error handling around these error codes, as there appears to be no way to programmatically know that an error occurred.
Setting up a Webhook for Error Handling
To overcome this issue, we set up a webhook using the documentation provided by Twilio. However, the payload received was different from what’s logged in the console. The webhook reported the delivery status as "SENT," while the console log showed "Underliverable" with the 30005 error. Moreover, the error code key was not present in the webhook event payload.
Finding a Solution
We searched the Twilio Messages API using various ID keys, but they always returned no results. Unfortunately, we couldn’t find any documentation on this issue, leaving us with no clear solution.
The Impact on the User Experience
In the meantime, the user is left waiting for a code that will never arrive, unaware that their mobile carrier has blocked the message. Moreover, our app is not even aware that an error occurred, leaving the user frustrated and unable to verify their account.
Conclusion
Error handling in Twilio Verify’s SMS service can be challenging, especially when error codes are not returned in the initial response. We hope that Twilio will provide better documentation on how to handle these error codes and consider implementing a more robust error handling mechanism to improve the user experience.
FAQs
Q: How can I handle error codes 30005 and 30006 in Twilio Verify’s SMS service?
A: Unfortunately, there is no straightforward way to handle these error codes programmatically, as they are not returned in the initial response. You may need to rely on the webhook event payload, which may not provide the necessary information.
Q: Why did my SMS fail to deliver, and how can I prevent it in the future?
A: Your SMS may have failed to deliver due to issues with the recipient’s mobile carrier or network. To prevent future issues, ensure that your users have a valid phone number and that their carrier allows SMS messages.
Q: How can I improve the user experience when an SMS fails to deliver?
A: Consider implementing a retry mechanism or alternative verification methods, such as email or voice verification, to ensure that users can still verify their accounts. Additionally, consider providing clear instructions on what to do if the user does not receive the verification code.
