- Have a large enough transaction volume, say, above $100k / mo.

- Use the contact form.

Note that if your transaction volume is $100k/mo, and Stripe takes 3% of it, it's $3k/mo for them. Maybe a customer that's worth paying extra attention to, but of course by spending a minimal amount of time.

I suspect that if your transaction volume were, say, $1M/mo, they would have contacted you already.