We are going to launch the app in the Shopify App Store. The app will provide the service of parcels delivery, specifically, we will provide merchants with shipping labels. As per Shopify rules, we can get an exemption not to use Billing API to receive payment for our service. Actually, it's almost impossible to receive payments using a billing option listed in the rules. Could you help me to get such an exemption due to the fact that the service we provide falls into the category in the exemption list?