Set up website project - Wix platform

Good afternoon.I created a website for my online sales and I am currently setting up a subscription project in order to increase customer loyalty and also the sales flow. I use the WIX platform, overall it's pretty good, but I don't have much experience in platform configurations. A few months ago I hired a person who received the money and did not complete the job. But now, knowing the freelancer, I realize that I can hire the right person without any problems. I need someone to make sure that every page on the platform and every SEO plan is ok. But mainly someone to help me with the payment setupBecause I already paid paypal twice and the payment button still doesn't work.