What determines your Continuing Professional Education (CPE) credits will depend on the rules of the organization you want to register the credits with. StationX doesn't specify CPE rules.
Often credits are given based on the number of hours trained.
Go to the organization to want to register with and determine what they need.
Here, for example, is the ISC2 rules for certificates like CISSP.
StationX certificates can be used as proof of the work you have done.