Simple PHP Script Amendments

Hi, I have a php script and there are 3 parts that are not working correctly. I need these checked and fixed. The issues are: 1 - When members make a payment, the script is not picking it up and converting them to a paid member. I believe it is something to do with the 'return url'. 2 - The 'gross total' reference is not showing the correct figure. This needs checking. 3 - In the admin area, when I click on a button to close the support ticket, it is not closing fully. These are basically 'find and check' issues and should not take too long. I will provide more details of each issue to the person who gets the job. Thanks,