I'm working on an ruby on rails app that has a special billing method.
I'm creating a store where users can reserve products but will not get charged for these products until a certain amount has been reached. This amount cannot be quantified by time so I'm wondering if this is a recurring payment. However, accounts will have to provide a payment method in order to reserve these products and it is cumbersome to have them give their information every time. What's more is that I need their information so I know they want the product but I won't charge it right away.
What to do?
First you want to capture card details up front, but not make any charge.
That can be done with most payment service providers (PSPs). Usually you will redirect from your site to a site hosted by the PSP which captures the card details. Once the user leaves that page they will redirect back to your site, and you will receive a payment Token, which is essentially a GUID which can be used in future transactions instead of a card number.
Each time you want to take payment from that card you can submit your Token Id and payment value to the PSP for authorisation and settlement. Bear in mind that its entirely possible that the authorization could fail or be declined.
This is technically known as a recurring payment in that there are potential complications which your PSP should handle for you, such as credit cards expiring, or being replaced. Decent PSPs will make use of the Visa Account Updater service, or the equivalent Mastercard Automated Billing Updater to ensure that behind the scenes the card number is automatically updated. Worth checking that your chosen PSP provides this capability.