Schedule with custom payment

Hi guys, my customer is based in Singapore and prefers not to use Squarespace's payment methods. They are opting to share a QR code and manually processing payment confirmation instead. Is it possible to still provide Packages and Subscriptions, and hide the error message? Thanks in advance!

Quote

Unable to add item to cart, it is a subscription and the business doesn't have a payment processor set up which can be used to process subscriptions.