Hello Adam,
Solved.
It was finally solved but using the WooCommerce Stripe Gateway plugin. Coincidentally, an old co-worker knew where the problem could be and has been browsing my website to see it. In the first place, I did not have the Woocommerce plugins activated (because I did not know that assets were needed already), then he has looked for the plugin that I was commenting on and another one (WooCommerce Blocks) and then he has managed to connect my sales platform with Stripe to through my personal passwords. He also had to configure the cart because I had disappeared … it seems that he created error pages for me for this absence.
Have a good day!!