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How can I improve the API that to work properly?

Hi @sanjiv_developersupport thanks for the reply. I have insert in Postman the data from https://developer.ebay.com/api-docs/static/oauth-refresh-token-request.html but something go wrong. The answer from the eBay server was: { "error": "unsupported_grant_type", "error_description": "grant type in request is not supported by the authorization server" } I attach here the parameter I have used in the call: POST https://api.ebay.com/identity/v1/oauth2/token HEADER Content-Type = application/x-www-form-urlencoded Authorization = Basic RnJhbmNlc2.... (the base64 encoding value from AppID:CertID) BODY grant_type = refresh_token refresh_token = v^1.1#i^1#p^3..... (oAuth Token for production environment) scope = https%3A%2F% 2Fapi.ebay.com%2Foauth%2Fapi_scope ( url-encoded https://api.ebay.com/oauth/api_scope) In brackets I included the more detailed explanation about the content I have included in the API call. Are you looking for some error in my API? Thanks in advance Francesco
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