Yes, you can redeem your points and use Shopify Pay.
Simply Click Apply Balance
Then select Shopify Pay as your payment method during checkout.
The reward discount should continue to reflect as a line item.
If you are logged into your Rewards account and the Apply Balance button is not showing in your cart, it is likely that you are already logged into Shopify Pay. You may need to log out and clear your cookies.
What's Shopify Pay?
Shopify Pay is a secure payment method offered by Shopify. You may have opted into Shopify Pay for future faster check out on ours or another Shopify website.
To prevent this, you can use this link to opt-out of Shopify Pay https://pay.shopify.com/optout. We use Shopify Pay, but it is not exclusive to our website so opting out of your account will likely change your check out experience on other Shopify websites.