https://www.nuget.org/packages/Zoominfo.API.Authentication.Client.NetCore
Com.Zoominfo.Api.AuthClient authClient = new Com.Zoominfo.Api.AuthClient.AuthClient("username", "clientId", "privateKey");
string accessToken = authClient.getAccessToken();
"-----BEGIN PRIVATE KEY-----\n" +
"MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCTLgTQx325tynx\n" +
"9g2c/Zcy4e+MVW9ZiN4/CES2wP/iYNQTeTPwzl1JCGGY37n9zwj/cdMNbjWaIHmA\n" +
"jjMpFjepXpZ8m80TOQjRYWrPAhW1qGEZ6CsNeiXi5uQ6H932b4gFG1YCaQG5AqFT\n" +
"01IkpHLEFHQNJ49pQ7C8G/k=\n" +
"-----END PRIVATE KEY-----";
Com.Zoominfo.Api.AuthClient authClient = new Com.Zoominfo.Api.AuthClient("username", "password");
string accessToken = authClient.getAccessToken();