One solution would be to have the memberships in OpenCart, then after someone purchases the membership you manually update their membership. Of course this is more work for you.
Yes, it would be nice if one could just tie the Dolphin cart to the payment processor in OpenCart, that would work as well.
This is going to be a custom job; as I said before, you can look at the vendors in the market offering integration services. One that I know of is Scriptologist and I think he has a solid reputation as far as I know, you can search the disputes forum for his name.
This brings to mind a related aspect of this topic. If the OpenCart developers can create several different payment methods in their TOTALLY free, no license required, platform, Andrew, why can't your company do the same? Two options for payment just does not cut it. This has been a long standing sore spot with Dolphin users.
Core payment methods
The OpenCart package offers a variety of payment methods, from bank transfers to online payment gateways. The following core payment methods are available with an OpenCart installation:
- AlertPay
- Authorize.Net (AIM)
- Bank Transfer
- Cheque / Money Order
- Cash On Delivery
- Free Checkout
- LIQPAY
- Moneybookers
- NOCHEX
- Paymate
- PayPoint
- Perpetual Payments
- PayPal Website Payment Pro
- PayPal Website Payment Pro (UK)
- PayPal Standard
- SagePay
- SagePay Direct
- SagePay (US)
- 2Checkout
- Web Payment Software
- WorldPay