I try to get through the ebay Auth application grant flow, but I have a problem, because I can't read the response ebay gives me. The problem relates in CORS policy problems and the exact message says: Access to XMLHttpRequest at 'https://api.ebay.com/identity/v1/oauth2/token' from origin 'https://example.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. I don't know where the problem relates in, so here is the way I try to access this API.

I redirect the user from my applciation to this ebay endpoint to retrieve the accesstoken: https://auth.ebay.com/oauth2/authorize?client_id=${clientId}&redirect_uri=${this.redirect_uri}&response_type=code&scope=${scope}

When redirected back after accepting the permissions my application needs to use the appropriate ressources, I extract the responed accesstoken from the URL and encode it.

Right after that I want to exchange these accesstoken to a usertoken by making a call to this endpoint:

const httpOptions = { headers: new HttpHeaders({ 'Content-Type': 'application/x-www-form-urlencoded', 'Authorization': 'Basic ' + btoa(this.clientId) + ':' + btoa(this.clientSecret) }) };

const data = { 'grant_type': 'authorization_code', 'code': accessToken, 'redirect_uri': this.redirect_uri };

this.httpClient.post('https://api.ebay.com/identity/v1/oauth2/token', data, httpOptions).subscribe( data => console.log(data), error => console.log(error) )

So when starting this process I always get the message back saying that the response has been blocked.

Does anyone know where my problem relates in and can help me? Many thanks in advice!

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