Hello：
1. When I use the billing API to charge merchants for the subscription plan, if merchants purchases a periodic service (every 30 days), in addition to the confirmation of the first purchase, is the merchant need to confirm every time in the second billing cycle and every deduction after that?
2. Will Shopify concentrate on the unified deduction of fees to the merchants at a certain time of the day？
or personalize the automatic deduction according to the subscription time of each merchant, which will be accurate to seconds?
