SilverShop\Checkout\Checkout::member_creation_enabled
4 different membership schemes: 1: creation disabled & membership not required no body can, or is required to, become a member at checkout.
2: creation disabled & membership required only existing members can use checkout. (ideally the entire shop should be disabled in this case) 3: creation enabled & membership required everyone must be, or become a member at checkout. 4: creation enabled & membership not required (default) it is optional to be, or become a member at checkout.
Signature
public function member_creation_enabled()