curl --location --request POST 'http://learnifier.com/orgunits//projects//participants' \
--header 'Content-Type: application/json' \
--data-raw '{
"email": "user@example.com",
"extid": "string",
"userid": "81590981-1e05-4fd5-aa15-15bc4b06cf7f"
}'{
"code": 0,
"field": "string",
"message": "string"
}