Marketing Credits are used for sending mail and for making calls.
To track where your Marketing Credits are spent:
Go to Account and Settings by clicking your profile picture at the top right corner. If you haven't uploaded a picture yet, you should see your initials instead.
Click Billing.
Click Marketing Spend Report.
At the bottom, you'll see an option to Select Date Range to filter the list by date.
You may also export the data before or after filtering the date range by clicking Export Purchases.
After clicking Export Purchases, an excel file will automatically be downloaded and saved to your computer. 😊