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If I'm not wrong, you must connect your credit card to Google Wallet to use it in the Play store. To remove your credit card from Wallet: Login to your account on Google Wallet. Click Payment Methods on the left side of the page. Click Delete next to the card you would like to remove.

Paypal does provide API access to manage this through the Recurring Payments API. The doco has a description of the workflow required, but of particular interest to you would be GetRecurringPaymentsProfileDetails. You could check the profile status or the date of last payment received to see if a payment has been made and act accordingly.

Hat tip to Gajus Kuizinas who has clarified this for me. You may not utilize Facebook Payments to sell virtual currency or other stored-value item that can be used outside of the app where the transaction was completed. In short, no: Facebook Payments cannot be used for digital downloads.

Ever heard of Bitcoin? It's a decentralized online currency. You can buy them using euros and sell them for euros again at a quite stable rate. One disadvantage is that I don't know any Bitcoin Exchange that does not incur a 1.20 EUR deposit and withdrawal fee. Apart from that, trade fees are usually around 0.55%, wich is reasonable, right? Credit cards are ...

I think EventHoller does everything you're looking for, it lets you create different ticket types and you can set limits on how many of each type are sold. It has a couple other cool features as well. It also accepts a variety of payment options, which you mentioned you are looking for. It also makes it easy for organizers and attendees to contact eachother, ...