Has anyone had any luck using z_stripe (Zucando Z Stripe Payment Gateway) with One-Page Checkout?

I have the latest version of Zen Cart, OPC, and Z Stripe. Without OPC, Z Stripe works properly. With OPC and using another payment method works. With OPC & Z Stripe, I can't get past the main checkout page. I added z_stripe to the list of Payment Methods Requiring Confirmation like the other Stripe module. When I click on Continue Checkout, the cursor spins and nothing happens... In the Network tab of inspect element, /ajax.php?act=ajaxOnePageCheckout&method=updateShipping is called. No unexpected javascript errors.