Looking for PG for my app

It falls under virtual digital assets/crowdfunding. Stripe is invite only for India whereas razorpay, cashfree not working for me (restricted business category)

Paypal is working for me but since my app is built on flutterflow, there's an issue with webview based payment gateway.

Any alternatives? Or anyone from stripe/cashfree/razorpay who can help me with onboarding?