I'm not sure I follow you. Are you planning to take one or more DSST exams? If so, and if you go to an Internet-Based Testing center, then you will pay by credit card on site when you take the exam. I'm not sure how it works for paper-and-pencil exams, as I have never done DSST that way. I don't get why TESC wants a DSST form from you, unless it's about sending a transcript for exams you have already taken.
-Gary-
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