It sounds to me like you need to do pre-authorization transactions to do the hold. When looking at gateways, check that their API supports it, and how long you

It sounds to me like you need to do pre-authorization transactions to do the hold. When looking at gateways, check that their API supports it, and how long you can do the preauth for. I use Beanstream for processing, and they aren't too bad. I've also heard good things about the API for braintree.