A developer identified a use case where a triggered send of an email is needed. The developer already successfully set up authentication with a Client ID and Client Secret has used them in several REST calls. When the REST call is made, a "401 Unauthorized" error is returned. What is the first thing the developer should check?

A developer wants to aggregate monthly energy usage data over a four month period for each subscriber within an email. The monthly usage values are stored in variables for each month in the following way:
How should the developer use AMPscript to generate the total?

A developer wants to include an AMPscript if/else statement in an email to satisfy the condition "if the subscriber's tier is not premier then display heading encouraging them to upgrade." The tier value has already been set as variable named @level. How should the developer write this AMPscript conditional statement?

From which business unit could the Contact Delete feature be used within an Enterprise 2.0 account?

Which action could the RaiseError AMPscript function be configured to perform?