Arduino IoT Cloud API update variable

I am trying to update a variable in the arduino iot cloud using the API. I am programming an esp32 module (programmed using Arduino IDE) to talk to the iot cloud api. Here is the relevant code:

http2.begin("{thing id}/properties/{property id}/publish");
http2.addHeader("Content-Type", "application/x-www-form-urlencoded");
http2.addHeader("Authorization", "Bearer " + mytoken);
httpcode = http2.PUT("{'value': 1}");

I get the following response:

{"id":"trdsBfai","code":"bad_request","status":400,"detail":"failed to decode request body with content type "application/x-www-form-urlencoded": {'value': 1} doesn't exist in app.propertyValue"}

I suspect there is something wrong with the http payload, but I am unsure how to format it. How is the api currently interpreting my payload? Any suggestions?

Can you post the full code?

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