At this time, we are not an express checkout method (like GooglePay), which can make shoppers think Sezzle isn't an option at checkout.
On Shopify, the option to checkout with Sezzle is at the very end of the order process - after the shopper chooses their shipping method, on the same page where they could enter their card information.
If Sezzle does not appear as a payment method at that point, it's likely the Sezzle gateway hasn't been fully installed. To configure this, please log in to your Sezzle account and navigate to your “Setup Checklist” (or click here). Then navigate to "Install Gateway via Shopify" – this will walk you step-by-step through adding us to your Shopify checkout page.
Additionally, if the shopper has opted into Shopify Pay, or if they have a Shopify account and pre-set checkout settings, they might not see Sezzle (or any other payment methods, like GooglePay) at checkout. In those instances, we recommend the shopper check out as a guest or uses a private browsing session to be able to checkout using Sezzle. If you have further questions on this setting, we recommend reaching out to Shopify directly.