Add Processing Fee

Need to add a Processing Fee to each transaction. Our group can’t absorb the costs of the credit card processing fees and need to pass it onto the purchaser. We’re looking to use the Pro version which integrates with Stripe. Stripe requires that this be a manual input before the user is forwarded over to Stripe for payment. So I need to add an item line in the summary of the purchase that adds: $0.30 + 2.9%. We can’t use the “tax” feature of EM because 1) we have a flat and a percentage fee we need to calculate and 2) we don’t collect taxes and it’ll look odd in our accounting.