When using SaaS mode with different Stripe accounts connected at the sub-account level, there is currently no way to link or manage existing Stripe customers/subscriptions without requiring customers to re-enter their payment details.

For agencies migrating clients from other platforms (or different Stripe accounts), this creates unnecessary friction, reduces trust, and risks losing customers during onboarding.

We need the ability to import, sync, or link existing Stripe customers and subscriptions directly to sub-accounts so billing can continue seamlessly without requiring any action from the client.

This functionality already exists at the agency level, and extending it to sub-accounts would significantly improve SaaS onboarding and retention.