eBay

https://api.sandbox.ebay.com/sell/fulfillment/v1/order/110553947168-29059256xxxThe above REST API not working in a sandbox. I am passing Authorization and Content-Type in a header. After being given a call, eBay returned an unclear error message. { "...

I want to get an access token in C# API for that I will need a refresh token, from where I can get it.

POST: https://api.sandbox.ebay.com/identity/v1/oauth2/tokenHeaders:Content-Type:application/x-www-form-urlencodedAuthorization:Basic SGFydFNvbnMtVGVzd........NjYtNjU3ZA==Body:grant_type:client_credentialsscope:https://api.ebay.com/oauth/api_scopeCan ...