1.Is the phone number of Shopify Charge.com 88874674739?
2.What's usage charge of Shopify?
Usage charges are part of Shopify's application billing API. The usage_charge endpoint allows your apps to charge a variable monthly fee for an app or a service. You should use this API to charge merchants for your product when the fees are recurring, but vary from month to month.
You can find general information about Shopify's billing APIs here:
Application Billing API
Recurring application charges API
One-time application charges API