Im using letsencrypt service and I want to push the generated _acme-challenge TXT Record through your API. If I use Record type A works but TXT doesn't.
{"statusCode":505,"type":"Validation Exception","message":"Invalid content."}

Did you ever figure out how to do this? I'm stuck with the same issue. Thanks!

This is what worked for me:

curl -X POST "https://api.dynu.com/v2/dns/123456/record" \
-d "{ \"textData\": \"This is a test\", \"domainName\": \"yourname.ddnsfree.com\", \"nodeName\": \"\", \"recordType\": \"TXT\", \"ttl\": 3600, \"state\": \"true\"}" -H "Content-Type: application/json" -H "Authorization: Bearer _____________"