You can let customers choose their subscription’s start issue when you use flexi-start subscription products.This option is available at a product level so you can choose which specific products allow for a customer-defined start issue.
When you create a new product, choose “Current or next issue” from the “Start issue” dropdown, which will create a flexi-start product.When selecting this product in the checkout, customers will see an option to choose from your current issue or the next one.