Each subscription has a Payment method, so you'll need to set up at least one enabled payment gateway that can be used by a customer to create a payment method for subscriptions. Note that the payment gateway must support stored payment methods, e.g. card on file, continuous authorizations, etc. Please refer to the list of known payment gateways that are being supported by their maintainers to identify "onsite" gateways that can be used.
Billing schedules are configuration entities that can be created through the admin UI:
Commerce >> Configuration >> Payment. See Subscriptions overview for additional information on billing schedules.
While it is possible to create standalone subscriptions, the more typical case is to create a product variation that will trigger the subscription. The Commerce Recurring module defines a
PurchasableEntitySubscriptionTrait for product variations. This trait can be enabled by checking the "Allow subscriptions" checkbox on the Product variation type edit form.
When the trait is enabled for a product variation type, two new fields are added to product variations of this type. One is a reference to the Billing schedule configuration entity. The second additional field is a reference to a Subscription Type plugin. Unless a custom subscription type plugin has been created, the only option you'll see for the variation's subscription type is, "Product variation."
Create a new product with a variation of the type you added in step 3. Select the billing schedule you added in step 2 and the "product variation" subscription type. You should now be able to place an order for a subscription by adding this new product to your cart.
After the product variation is added to the cart, the price charged for the order item may need to be adjusted if prorating is required or the item has a "Postpaid" billing schedule. The Commerce Recurring module does this by adding a "subscription" type Adjustment to the order. (The order item's price remains unchanged.) This order processing takes place in the
process() method of the
If the billing type for the variation's billing schedule is "prepaid", the billing schedule's plugin is used to generate the "first" billing period. And the billing schedule's prorater plugin uses that billing period to calculate a prorated unit price. If the prorated unit price is less than the order item's unit price, an adjustment is created in the amount of the difference between the two prices.
If the variation's billing schedule is "postpaid", then the customer should not be charged for the subscription order item at all. So a negative adjustment in the amount of the order's unit prices is created.
In the next section, we'll look at what happens when checkout completes for an order that includes a subscription/recurring product.
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