A: There is a possibility that the number of active customers in your store has surpassed the maximum limit allowed in the free plan, which is 300.
In the free plan, the maximum amount of active customers is restricted to 300 and if you surpass that, there will be an additional fee of $0.3 per customer.
Please verify the number of active customers in your store and ensure that the plan you are using is suitable for your needs.
Adding on, the additional fee for surpassing the maximum number of active customers is detailed below.
Free plan (max. 300) - $0.3 per exceeded customer
Basic (max. 500) - $0.22 per exceeded customer
Pro (max. 2000) - $0.18 per exceeded customer
Enterprise (max. 5000) - $0.1 per exceeded customer
For more information, refer to the article below.