There are a few things that can cause the checkout to display a $0 when buying a subscription. Most of the time it's because of a symbol in your product description, specifically the equals sign (=). If your product description has an = sign in it, please try removing it and attempting to checkout again.
To view and adjust your product description, follow these steps:
- From "Shopify Admin", select Products.
- Select the product that is displaying as $0.
- In the "Description" field check for and remove symbols.
- Select Save.