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I've been having the same issue, and took a while to go through the forum.

This topic has the solution:
https://forum.opnsense.org/index.php?topic=30356.msg146448#msg146448

But for sake of completeness, your JSON body should look this this:

'{"pipe":{"number":"100","enabled":"1","bandwidth":"300","bandwidthMetric":"Kbit","mask":"none","codel_enable":"0","codel_ecn_enable":"0","pie_enable":"0","description":"TestPipe"}}'