https://support.huaweicloud.com/intl/en-us/usermanual-billing/en-us_topic_0083138805.html
Unsubscription Allowed_Unsubscribing from In-Use Resources_Unsubscriptions_Orders_User...
When you are unsubscribing from in-use resources, the refund is calculated based on the paid amount of the order. The consumed amount will be excluded, an...
in useunsubscriptionallowedresourcesorders
https://www.brevo.com/glossary/unsubscription/
What is a unsubscription? | Brevo Glossary
Unsubscription is the process of opting out from receiving further emails from a sender. This option is required by email regulations to respect recipient...
what isunsubscriptionbrevoglossary