wordpress/learnpress and woocommerce

hello, i created a wordpress site. I created the site to sell training and products. so I downloaded learnpress and woocommerce plugin. I also uploaded a paid plugin to merge woocommerce and learnpress cart so that customers have only one cart to add trainings and products. The problem is that I added them both on one page but the two accounts are different and I would like a customer account for both. I also have a problem with the order numbers not following each other. I downloaded a plugin so that the woocommerce order numbers follow each other but the plugin does not work on the learnpress it's been two invoices so I would like to delete the learnpress invoicing and keep only the woocommerce. I would therefore like to group elements of learnpress in the woocommerce to create a single customer account in which there would be a bit of both. I also have a problem of an error page showing in the assignments page.Error thrown
Call to a member function get_user_item_id() on bool ...... and last thing in the learnpress add on certificates the client can infinitely download a certificate but if he changes his name in his account then he can print again a certificate in the name of someone else this is a real problem. thank you .... obviously the modifications must not leave during the update of the plugins !!!!!!!!!!