Create Report - 400 Invalid Input

[JordanForeman]

👋 I'm attempting to generate a particular report, but am consistently faced with the same error:

{
    "code": "InvalidInput",
    "message": "Invalid Input",
    "details": ""
}

I've attempted a few different reportTypes, all resulting in the same error. I've also tried limiting the marketplaceIds that I send as well. The empty description provides no help 😞

According to the reportTypes documentation, GET_FLAT_FILE_OPEN_LISTINGS_DATA has no required options, and so simply providing marketplaceIds should be enough (that is if I'm understanding the docs correctly):

And I am signing the request with STS credentials having assumed the correct role (same as needed to generate an LWA token, which is provided in the x-amz-access-token header):

Is there a trick to making this API actually work? Has anyone been able to create reports using Selling Partner API? Would love some help here if possible

[JordanForeman]

🤦 the problem was the request content-type. Converting to raw JSON (rather than x-www-form-urlencoded) solves the problem.