I think you should consider these web service API's for completion info
core_completion_get_activities_completion_status - activities completion
data
core_completion_get_course_completion_status - course completion data
With regards to the user enrollment dates AFAIK you need to write your own
web service for that.
El mié., 17 abr. 2019 a las 14:31, Derrich Schleich (via Moodle.org) (<
General developer forum
Get user enrollment date and completion date via API
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