"error": "The API key in request is either null or blank or invalid." When post Access Token in TD Ameritrade

userMe5V 0
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I am getting the below error with the PrintScreen when trying to get the access token in TD Ameritrade. enter image description here enter image description here

Can I know how to fix the error? BTW, there is a parameter "code", what should be the parameter content?

ameritrade postman api
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