Is there any API that provides credit availability, or at least the total original credits and current credits expended for B2C Commerce On-Demand Sandboxes?
There is no API that provides remaining B2C Commerce On-Demand Sandbox credits. We only provide the usage APIs for sandboxes and for overall realms.
The workaround here is to subtract the minutes used (calculated via the usage APIs) from the original number of credits. Note that 1 uptime minute = 1 credit, and 3 downtime minutes = 1 credit.
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