Pay To Join

We already charge people to join our program, but the way we do it is not very smooth, so being able to add this at the registration stage (pay when registering) would be a huge problem solved for us. We currently redirect people to purchase a product from the woocommerce shop and then we need to check and approve the application thereafter. However, we would also like to be able to give the person a discount code so they can register for free as we have both paid and free members. So if this could be processed through the normal checkout that would help with using a code/voucher to enable registration with either a discount or free.