Does the 5% + 50c include the whole payment process on top of the tax-handling? As in, the alternative is paying 2-3% anyway to someone like Stripe for integrat

Does the 5% + 50c include the whole payment process on top of the tax-handling? As in, the alternative is paying 2-3% anyway to someone like Stripe for integrating payments, so that the cost of off-loading all int'l VAT and co headaches is around 2-3% (the 50c is negligible for my use case)?