High-volume instances are among those most likely to be using Custom Activities, but those instances are the most likely to need many Custom Activity entries sent back to Marketo.
As an integration developer, I would like the ability to bulk import Custom Activity entries to an instance. For example, if I'm running a process outside of the Marketo UI and need to note the 10,000 records that were affected by other software in a company's martech stack with a Custom Activity, there's no way to do that short of using... 10,000 API calls. This is both inefficient and puts high-volume instances at the risk of running over their API call limit.
The idea would be much the same as other bulk imports done today, and could use the exact same import format that the Bulk Activity Export data uses today.
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