I'm building a site which will notify users via SMS when there is a new job that meets their criteria. Currently they then have to login to the site and pay (via Paypal) for the lead details (if they are interested).
What we want to do is have them reply to the text, and we somehow automatically take the payment, then SMS them the details.
Now I know we can automatically take payments using a payment gateway so long as we store the credit card details. But due to the security required to store credit card details we'd ideally like to use a payment provider who can manage that side of things.
Paypal and Google checkout offer something similar, but its still based around monthly billing just with a variable amount. And in our case the payments could be any time.