I am looking to modify an existing customer reviews application on my website to allow for review submissions via SMTP PHP and Google OAuth2 authentication. The current application resides on a page with a large container that I wish to resize to better fit the overall design. No styling changes are needed, only backend coding modifications to integrate the new submission methods. Specifically, the reviews form would need to be updated to use SMTP for sending submissions and include Google app password for visitor authentication during the process. Testing and validating the revised functionality will also be required. The codebase and page template are fully functional already, so this involves targeted changes to integrate the new submission integration rather than extensive development. Familiarity with PHP, SMTP, and app password protocols is essential. Once completed, the updated reviews application should allow anonymous visitors to seamlessly submit and authenticate reviews from the front-end page without needing a separate administrator interface. Sample source code and a link to the live page for reference will be provided to selected candidates.