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Authorize.net, though we don't really like it. The API is ugly and we can't update a recurring bill (so if someone changes their plan we have to ask for their payment info all over again). It's not enough of a priority to change it right now, because most of our clients pay us offline anyway, but eventually we'd like to move to something a little more modern.

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You can't change the amount with ARB? I thought you could.

Store their card data in Authorizenet CIM and run a nightly cron job to make the charges you need. You can charge whatever amount you need and never have to ask for payment info twice.

Yes, you can change the amount with ARB -- once you have the subscription id, you can change pretty much anything about that subscription.

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