Google Pay for PrestaShop 9.0.2

I run an e-commerce website on PrestaShop 9.0.2 and need Google Pay added to the existing checkout flow on the web storefront. The job includes installing or developing a compatible payment module, configuring it with my Google Pay merchant profile, and verifying that everything works smoothly in both test and live environments.

Key deliverables:
• Google Pay button visible at checkout beside existing methods.
• Proper tokenization and secure transaction handling that passes PCI compliance for Web payments.
• Successful end-to-end test transactions in Google’s sandbox, then in production.
• Clear deployment notes so I can reproduce the setup on a staging site or after future upgrades.

Acceptance criteria:
1. A customer can complete a purchase with Google Pay on desktop and mobile browsers without page errors.
2. Orders paid with Google Pay appear in the PrestaShop back-office with all transaction details recorded.
3. No core files are modified; the solution survives theme or version updates within the 9.x branch.
4. Full documentation of any API keys, callback URLs, and configuration steps is provided.

I already have admin access, FTP, and Google Pay credentials ready, so you can start as soon as we agree on a timeline.