Product page issue

I have a few issues with a product page:

• I cannot not set the URL slug correct, as it takes the standard blog category. I want the slug have my shops slug instead of the blog slug. So my shop is at https://www.angelovanderklift.com/fotoshop and a product goes to https://www.angelovanderklift.com/blog/product/item This should be https://www.angelovanderklift.com/fotoshop/product/item How do I set this the correct way?
• At the product page I have set a featured image. But everytime when I update the product, the image won't appear at the product page anymore. I have to set the Featured image again. That is pretty annoying.
• At the product page I cannot ad the price of the product. It doesn;t show it. That is a HUGE disadvantage. For me this is a NO go. With that said, I really would like to be free of how my pages appear. So I would like to have each productelement to be a part of Gutenberg system. So I can add a title, a description, a price, etc at any place I want.
• I have set Stripe the correct way. But during payment I receive this message: You did not provide an API key. You need to provide your API key in the Authorization header, using Bearer auth (e.g. 'Authorization: Bearer YOUR_SECRET_KEY'). See https://stripe.com/docs/api#authentication for details, or we can help at https://support.stripe.com/.

This is it for now. Hope anyone can help me with this.