Hello,
I have the same problem. I really want to link my existing Stripe account with Shopify and not create a new stripe / Shopify account altogether.
Can you help with this?
I am based in Japan
Stripe doesn’t appear as a Third Party App 
Topic summary
Core Issue:
Multiple users want to connect their existing Stripe accounts to Shopify stores, but face regional restrictions. Shopify Payments (powered by Stripe) is the default gateway in supported countries, and when available, prevents direct Stripe integration.
Key Limitations Explained:
- In countries where Shopify Payments is available (US, Canada, Japan, etc.), direct Stripe integration is typically not possible
- Users cannot link existing Stripe accounts to consolidate transaction data across multiple platforms
- Using third-party payment providers instead of Shopify Payments incurs additional transaction fees
- Some users report missing payment methods (Google Pay, Giropay, iDEAL) available in Stripe but not in Shopify checkout
Potential Workarounds:
- Contact Shopify support to request Stripe enablement based on specific business needs (no guarantee of approval)
- Use third-party apps like “Paid Members App” or “Easy Pie Checkout” to embed Stripe payment buttons/links directly
- One user suggests temporarily changing store country settings (not officially recommended)
Status:
Discussion remains open with users seeking solutions for workflow automation, cost savings (0.04% fee difference noted), and payment method expansion. Official guidance emphasizes using Shopify Payments in eligible regions.