Syntax for REST API to have bold formatted and multiple lines in product description [closed]

by

Through more experimentation, I found the culprit-

This does not work:

curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonDataEncoded);

This does work:

curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));

So it was the processing of the data in $data through curl which was causing the permission problem.