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When Saved Cards is enabled, the payment method section will appear above the billing address section in checkout. When not enabled, the billing address section appears above the payment method section. If you are using custom fields, the location of these fields may change upon enabling Saved Cards. Previewing your changes before publishing is recommended.
Before you can use the Saved Cards feature, Customer Registration must be enabled for your store. Learn how to enable Customer Registration.
Click the Store link.
In the Customer Registration Settings area:
If you have never enabled Customer Registration for your store, upon enabling, Saved Cards will also be enabled by default unless you manually select Disable for the Saved Cards option.