Without encryption, an unsuccessful response singapore mobile number list would have saved these variables in plain text. Now the data will be saved in its secure, encrypted form. You can also check your call history to confirm that the digits have been replaced with *redacted* . Is this setup secure? By following this tutorial (including the optional pci mode steps), you should prevent login data from appearing in plain text anywhere in the twilio ecosystem.
Similarly, no one at twilio should be able to decrypt your sensitive data. This will strengthen your configuration over the default settings. However, because the secret encryption and decryption key is stored as an environment variable on the service, users to whom you grant access to twilio functions to decrypt the values.