If Multiple Payment Methods is selected your store will remain a Single Payment Method store until the new theme version is published. This empowers you to: 

• Switch to a Multiple Payment Methods store and theme functionality with no downtime
• Preview the new theme type before publishing
• Prepare a multiple payment methods supported theme with ease before converting to the Shopify Checkout Integration  

Note: Switching to a multiple payment method theme version includes all the updates released in Novum 4.2.0

If Single Payment Methods is selected, the following updates are included: 

• When customers make a shipping address change to one subscription, they are encouraged to make the change for all other associated subscriptions or to just update the single subscription. 
• The billing information page is now called the `Payment methods` page and is the sole location for customers to manage payment and billing information. 
• The `Payment methods` page has 3 functions - 
• Change payment method - the ability to add a new payment method - this card will replace the existing card being used.
• Edit - the ability to edit the billing information on an existing payment method
• Delete - the ability to delete a payment method
• Automatic Renewal Law cancellation flow update
• Bundles customer portal widget
• Force Shopify customer account logins feature