User Story:
As a participant, I want to pay for special events so that I can attend premium activities (e.g., Rally Tascas).

Acceptance Criteria:

• Some events require payment to register.
• Users cannot complete registration without successful payment.
• Paid registrations appear in the Orders Page alongside ticket purchases.
• Users receive payment confirmation emails after registration.
• Refund policies follow ticket refund rules, and users must request refunds via email.