MT-21887: Update account billing usage for marketing plan#39

edwardhura wants to merge 1 commit intomainmailtrap/mailtrap-openapi:mainfrom

MT-21887-expose-email-campaigns-usage-in-account-billing-APImailtrap/mailtrap-openapi:MT-21887-expose-email-campaigns-usage-in-account-billing-APICopy head branch name to clipboard