Perfumcity.pl online store on presta shop

Good day, I need an IT professional to take care of my website. On prestahop when I want to log in it displays this error :Syntax error: syntax error in /usr/home/trawka123/domains/perfumcity.pl/public_html/classes/module/Module. php(1361) : eval() code in line 27 [PrestaShop] Critical error in :/usr/home/trawka123/domains/perfumcity.pl/public_html/classes/module/Module.php(1361) : eval() code: syntax error

Customers have been telling us that they can't make payments so I wrote to pay support and they, investigating the matter, found that someone hacked the site. Please help. In the next step I would like to do an integration of my store with the warehouse of another perfume company, I have all tokens and keys from them so I think it would not be so difficult.

I look forward to hearing from you. Best regards Monika Burkowska