Paying for Washington Machine learning specialization and the Capstone project

I am currently taking the first course in this specialization and it does not say when is the deadline to pay, in other courses with the old layout it usually stated the deadline. So my first question is about the deadline for paying and joining the track, some said that it is until the capstone project is offered is this correct? Another thing is with the capstone project, can I finish other courses in the specialization without applying for the certificate and then pay for the capstone only ?


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