Alter the default subscription billing interval using Subscription for WooCommerce
Subscription for WooCommerce plugin allows you to set a fixed subscription/billing interval recurring on every one-sixth day/week/month/year as shown below.
However, you can alter the default subscription/billing interval into the required one by using a code snippet. Inserting the below-given code snippet to the active theme’s functions.php file will add an additional value ‘every 10th’ within the interval selection dropdown.
Therefore, the resultant screen is as shown below: