Square Checkout Gangsheets Integration for DTF Store

I have a Lovable-hosted site and an existing, fully-functional Drip App gangsheet builder that I now want running smoothly on that platform. The builder we tried to develop inside Lovable suffers from severe performance issues, so rather than debug it further I’d like to scrap the in-house code and simply embed the proven system we already trust.

Here’s the outcome I need:
• The external Drip App gangsheets tool embedded in my Lovable site, styled so it feels native.
• A seamless Square payment and checkout flow that captures the gangsheet order data, processes payment, and returns confirmation to both the customer and our admin dashboard.
• Clean, fast performance with no lag or timeouts, even during large file uploads.
• Clear hand-off notes so we can manage basic updates ourselves.

I’m particularly interested in developers who can show prior experience integrating third-party apps and Square APIs on low-code or CMS platforms like Lovable. If you’ve solved similar performance bottlenecks or payment-flow challenges before, let me know—your track record matters most to me.