Claude API Card Payment Integration

I need a clean, reliable way for users to make a single, one-time purchase of a Claude AI API key using their credit or debit card. The flow should be as simple as “Pay → receive the unique key instantly,” with the transaction recorded in my database for later auditing... (Budget: ₹8000 - ₹19500 INR, Jobs: API, Braintree, JavaScript, Node.js, Payment Gateway Integration, PHP, Software Architecture, Stripe)