30123: Callback URL is missingPositive FeedbackNegative FeedbackERROR: 30123error-30123 page anchorPositive FeedbackNegative FeedbackPROGRAMMABLE SMSERROR Descriptiondescription page anchorPositive FeedbackNegative FeedbackCallback URL is missing Possible Causespossible-causes page anchorPositive FeedbackNegative FeedbackUser did not include callbackUrl field Possible Solutionspossible-solutions page anchorPositive FeedbackNegative FeedbackPlease follow doc for setting up callback URL.