Please let me know the pricing!

You can check it out on the Shopify App store.

Please check the plans on Ranky's Shopify App store page.

If the number of users exceeds the plan's included limit, an additional usage-based fee will be charged for every 100 users.

For example, if you're on the Basic Plan with 10,000 users included and your total number of users reaches 31,500, upgrading to the Pro Plan — which includes up to 50,000 users — may be more cost-effective.

The number of customers, which is the basis for pay-as-you-go billing, is usually checked sequentially on the 1st day of each month.

Reference: Please let me know about the customers who will be evaluated target.