'invalid client when POSTing JSON to get OAuth token

I am using perl to POST a JSON object to fetch an Oauth token but am getting an "invalid_client" response. (I checked, and it doesn't look like I have a Client Secret set up.) I'm following the sandbox tutorial/walkthrough but am stuck at this point. Here are the relevant details (redacted):

url: 'https://sandboxapi.ordercloud.io/oauth/token'
JSON data
{
    client_id:  "XXXX",
    grant_type: "password",
    username:   "admin01",
    password:   "XXXX",
    scope:      "CatalogAdmin BuyerReader MeAdmin InventoryAdmin PasswordReset OrderAdmin PriceScheduleAdmin ProductAdmin ProductAssignmentAdmin ShipmentAdmin"
}
Headers: Content-Type   => 'application/json', Content => [JSON above]

I'm not sure if I have the url correct or if I have all necessary headers. I'm guessing the SDK abstracts a lot of that stuff but I'm not using it.

ordercloud


Solution 1:[1]

The accepted Content-Type is application/x-www-form-urlencoded for authentication calls to OrderCloud. You can read more about authentication here.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 M. Posthumus

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