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Support agents frequently receive similar queries. Sending the same emails over and over is definitely not how they should be using their time. Canned responses are the best way to boost productivity and slash the amount of time spent writing emails or similar responses.
A list of these responses can decrease support agents average response time allowing them to solve more customer queries. When there are similar queries from different customers, it can be a time-taking process to respond to each incoming ticket around one issue. One can create responses for frequently raised queries and use them while answering.