POC big step

Source/ProofOfConcept/Models/Token.cs

@@ -0,0 +1,15 @@
+namespace ProofOfConcept.Models;
+
+public record Token
+{
+    public string AccessToken { get; init; }
+    public DateTimeOffset Expires { get; init; }
+    public string TokenType { get; init; }
+    
+    public Token(string AccessToken, int ExpiresIn, string TokenType, DateTimeOffset? received = null)
+    {
+        this.AccessToken = AccessToken;
+        this.Expires = received?.AddSeconds(ExpiresIn) ?? DateTimeOffset.Now.AddSeconds(ExpiresIn);
+        this.TokenType = TokenType;
+    }
+}