Hi We have a service that our customers pay to use. Payment is determined by how much they use. Every customer has a credit account for which they can buy more credits and usage is deducted from there. Now how can we make this automatic, so that our customer just enters their credit card information (either at our site which we will send to paypal, or directly to paypal) and it is charged automatically user-defined amount when their credit account is below user-defined limit?
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