Learning REST API for Create an assignment record

Summary:

We are trying to create learner assignment record using Learning REST API hcmRestApi/resources/11.13.18.05/learnerLearningRecords. We want to assign learners to a primary offering. Looks like primarySelectedCourseOffering array should use for this. However we found difficult construct this as document not providing any sample json payload or attribute that need to include in primarySelectedCourseOffering. Could you please provide a sample json payload for assign learner to a course offering?

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