Have ShopPay Installment Branding In Buy Button Code

[clarkr6]

I'm using the Shopify buy button to display collections on my Squarespace website. I talked to a Shopify rep and they said it was possible to add the ShopPay branding (ex. $XXX per month with ShopPay Installements - under price) to the buy button code but they did not have the code for me. Has anyone added this branding before? If so, h