Hi Jason
Here something I found:
Q: Why has my credit card / debit card been authorized for $1.00 after registration?
A: Sometimes a $1.00 temporary authorization hold may be applied to your credit card / debit card after registration. The authorization procedure is required to ensure your card is valid. Typically, these holds are removed after 48-72 hrs. The full amount will immediately be credited back to your bank account or credit line. No permanent charges will be applied to your credit card for signing up as a regular member unless you purchase a membership.
Thank you
Sam