Fix Stripe & Access Issues

My site, https://flowclinic.ai, is live, and two urgent issues need immediate attention. First, the Stripe integration occasionally throws errors or drops webhooks, leaving some payments in limbo. Second, when payments do succeed, the associated user permissions are sometimes incorrect—free users might see paid features, or staff roles overlap with admin access. I need a developer who can step in quickly, trace the root cause, and deploy reliable fixes without disrupting service.

What I expect:
• Review the existing Stripe setup, including API keys, webhook endpoints, and error logs.
• Locate and correct any backend code or configuration that causes failed payments or missed events.
• Verify that each subscription or one-time payment assigns the right plan and feature access instantly.
• Audit role-based permissions for users, admins, and staff, tightening policies where needed.
• Create a concise test plan, validate on staging, then roll the fixes to production.
• Document all changes so the system remains maintainable.

Our tech stack is typical for a modern SaaS (JavaScript/TypeScript, React, Node, and a relational database), but I am open to your preferred debugging tools as long as you resolve the Stripe and permission issues quickly and cleanly.

If you have solid experience with Stripe API, webhooks, and role-based access control, please tell me how soon you can start and share a brief example of a similar fix you have delivered.