How to upsell to a subscription in checkout
If you use Skio, Recharge, Smartrr, Appstle or any other subscription app, you can use UpsellPlus to upsell one off purchases to subscriptions in the checkout.
Create a checkout offer
Click 'Create offer' > Checkout
Note: upselling to subscriptions is currently only available for Shopify Plus merchants using checkout.liquid for their checkout. Checkout Extensibility does not yet support this functionality.
Add a product with a selling plan
Choose a product in the resource picker that has at least one selling plan in your subscription app.
Tick 'Add as a subscription'
This will show you all the available selling plans for the selected product

Choose your selling plan
Cool! Now you have an upsell set up that will show the subscription product. Add some copy in the callout banner, product title, subtitle or marketing message to make it clear to customers this is a subscription.

Now the upsell will be added to cart, but it won't replace the item in cart yet. To let the customer swap out a one off product for a subscription:
Go to the Smart Rules card, Variants tab
Tick 'Swap product in cart with upsell product variant if added'

You can set up smart rules so the subscription offer only shows when someone has the one-off version of the product in cart.
Create a checkout offer
Click 'Create offer' > Checkout
Note: upselling to subscriptions is currently only available for Shopify Plus merchants using checkout.liquid for their checkout. Checkout Extensibility does not yet support this functionality.
Add a product with a selling plan
Choose a product in the resource picker that has at least one selling plan in your subscription app.
Tick 'Add as a subscription'
This will show you all the available selling plans for the selected product

Choose your selling plan
Cool! Now you have an upsell set up that will show the subscription product. Add some copy in the callout banner, product title, subtitle or marketing message to make it clear to customers this is a subscription.

Now the upsell will be added to cart, but it won't replace the item in cart yet. To let the customer swap out a one off product for a subscription:
Go to the Smart Rules card, Variants tab
Tick 'Swap product in cart with upsell product variant if added'

You can set up smart rules so the subscription offer only shows when someone has the one-off version of the product in cart.
Updated on: 24/01/2023
Thank you!