How to use API with data post in Power bi

Hi Shellysethi ,

Please try like this:

let
    url = "https://api.somevendor.com/api/",
    headers = [#"Content-Type" = "application/x-www-form-urlencoded", #"Accept" = "application/json"],
    postData = "Any sort of text data you want to post to the API",
    response = Web.Contents(
        url,
        [
            Headers = headers,
            Content = Text.ToBinary(postData)
        ]
    ),
    jsonResponse = Json.Document(response)
in
    jsonResponse

Or refer to the following post.

Connect to a Web Service sending parameters - Microsoft Power BI Community

Best Regards,
Community Support Team _ kalyj

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.