Is there a limit for iControl Rest API POST requests per minute?

Thanks for the reply. I started using transactions with token auth, however I'm hitting a weird issue: when I try to commit the transaction, I get an error stating that the transaction ID failed. This is what my request looks like:

Method: PATCH

URL: https://my.bigip.com/mgmt/tm/transaction/1234567890

Body: { "state": "VALIDATING" }

...which is what the documentation shows to do. However, I get the following error...

{

  "code": 404,

  "message": "Missing transaction ID for this call.",

  "errorStack": [],

  "apiError": 2

}

Have you ever hit this issue before?