If you're trying to purchase a pass and your payment wasn't accepted, there are a few reasons it could have been declined:
Your bank rejected the transaction.
You have a bike out or your last bike wasn’t properly locked.
You have an active Day Pass.*
*You can’t purchase a new pass using the same credit card while you still have an active pass. If you purchased a Day Pass and wanted to buy a second Day Pass before the first pass expired, you would have to use a different credit or debit card.