amendments in a simple php project

i have a simple php project made for shopkeepers or vendors which we have made, but it has many issues and missing things which we require. i will share some prerequisites for the project which we got from client. m sending them as it is, but most of the pages we have already made, so the tasks are as follows: 1. QA and corrections which u prefer 2. U need to complete missing functionalities (if any) 3. some corrections after testing from client. we need it to b done in 5 days, as we think it is not so much work, coz we have made most of it by ourselves