There isn't currently a separate "pay now" link sent by email specifically for a program registration — payment for a registration happens as part of registering, on the same visit.
If you completed payment
You'll land on a confirmation page right after paying, and a confirmation email follows shortly after to your contact email address, with your registration number and a breakdown of what was paid. If you don't see it, check your spam folder before contacting the club — email delivery can occasionally be delayed.
If you started registering but didn't finish paying
If you left the registration page before completing payment (closed the tab, your card was declined, or you got interrupted), the safest next step is to contact the club directly and ask them to check on your registration, rather than starting over from the original link. Filling out the registration form again can create a second, separate registration attempt for the same athlete rather than resuming the one you started — your club can tell you which registration is the one to pay, and take payment another way if needed (by phone, in person, or by sending you a new link to complete).
If you're not sure whether your payment went through
Contact the club directly with your athlete's name and the program — they can look up your registration and its payment status directly, and this is more reliable than guessing from what your card statement shows, since a pending charge can look different from a completed one depending on your bank.