Stripe Subscription Integration for WordPress

I need to integrate Stripe's metered subscription billing into my existing WordPress site. We're currently using some plugins to manage subscriptions, but we need custom code to seamlessly incorporate Stripe's metered billing features.

Key Requirements:
- Integrate Stripe metered subscription billing
- Work with existing WordPress subscription plugins
- Ensure secure and compliant payment processing
- Provide documentation for maintenance

Ideal skills and experience:
- Strong experience with WordPress and PHP
- Familiarity with Stripe API, especially metered billing
- Experience with WordPress subscription plugins
- Good documentation skills

I already have the integration set on one website, which I am closing; I need it copied and applied to the new website.