I would like to know about the process to add extra service charges in (%) only in checkout page, that is also for specific payment gateways and not for all. We are using normal Shopify Plan(Not the Plus one). Is it possible to do the required things in normal plan? Or do we need to upgrade to the Shopify Plus plan to achieve the same?
You may want to add extra charge via shipping fee? I found that there are some apps that can help you add extra fee (Digital Takeout as a candidate).