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[Vendor] Usage API can accumulate usage instead of just overwriting

Before this update, the Usage API would always react to multiple batches of usage sent on the same day in one way: it would overwrite old batches with the new batch. Now this behavior can be changed. Vendors can now send a new parameter called overwriteSameDayUsage when posting usage, and if set to false, usage batches will accumulate instead of overwrite one another. Learn more here