Squarespace Single-Checkout Subscription Integration

I run a Squarespace store that sells software licence plans. Each plan needs two charges: 1. A one-time upfront fee that covers setup, the first month, and a reserve 2. An ongoing monthly subscription... (Budget: $30 - $250 USD, Jobs: API Integration, Coding, eCommerce, HTML, JavaScript, PHP, Squarespace, Stripe, Web Development, Website Design)