Recode a wordpress page function

I have a site made with wordpress. I currently use wordpress, with Buddypress wordpress plugin, BuddyBoss theme and [login to view URL] plugins (which include CM Registration Pro, CM Registration Bulk Invitation Addon, CM Registration EDD Payments Addon and CM Site Access Restriction Pro with Paypal Gateway with WooCommerce Subscriptions ( by Automatic)), WooCommerce Stripe Gateway and PayPal for WooCommerce (By Angell EYE). The problem that I need a freelancer (with experience) to solve, is that currently when a user registers as a member (using the secret subscription code sent by CM Registration Pro) the system is supposed to redirect the user subscribed to the page of payment cart (from woocommerce) to choose the type of membership he wishes to pay, then click on the checkout button for him to complete his payment and when he completes his payment on the checkout page (paying with Paypal or Stripe) then the system redirects it to him in order to login. If the client does not pay his membership first, the system does not allow him to Login until he pays his membership. Currently the problem I have is that when the user registers to be a member (using CM Registration Pro and the secret invitation code sent to him by email) the system redirects him to an empty cart. If the user tries to choose a membership in the Shop page, then when he is going to pay a message appears that says: "An account is already registered with your email. Please log in". That way, the system does not allow him to pay or log in to his account. Please, I need you to solve this problem so that every time a user registers (with his invitation code) the system (CM Registration wordpress plugin) sends the new registered member directly to the payment cart, which appears in the cart the total membership payment of him, and that after the user makes his payment on the Checkout page, then the system allows him to login. This, structured as I want it, was working until the beginning of November and then the programming changed, I don't know how. Everything is already programmed, and the wordpress page is fully created, developed and built, so all I need is to fix the coding so that when a user registers as a member, he will be redirected to the cart page with the chosen subscription and the amount to be paid, then the customer can click on the checkout button, can pay and after paying then be redirected to login on the website.