get https://test.billing.gg/api/v1/customers#customer_id
Get a customer by the merchant's customer ID
To obtain a merchant customer_id, which is a 10-digit alphanumeric identifier, list customers. See List customers.
The response to this request is an array of customer entities, so it may contain more than one customer if your customer_id is not unique.
If you are getting a customer to update that customer, please pay attention to the different address format that you must create in the customer data objects to update a customer.