Optional parameters for authorization request added

src/main/java/com/coinbase/api/CoinbaseImpl.java

@@ -1172,6 +1172,18 @@ public URI getAuthorizationUri(OAuthCodeRequest params) throws CoinbaseException
             throw new CoinbaseException("scope is required");
         }
 
+        if (params.getAccount() != null) {
+            uriBuilder.addParameter("account", params.getAccount().toString());
+        }
+
+        if (params.getReferral() != null) {
+            uriBuilder.addParameter("referral", params.getReferral());
+        }
+
+        if (params.getLayout() != null) {
+            uriBuilder.addParameter("layout", params.getLayout());
+        }
+
         if (params.getMeta() != null) {
             OAuthCodeRequest.Meta meta = params.getMeta();
 

src/main/java/com/coinbase/api/entity/OAuthCodeRequest.java

@@ -78,13 +78,33 @@ public String getSendLimitCurrency() {
         }
     }
 
+    public enum Account {
+        SELECT("select"),
+        ALL("all");
+
+        private String _value;
+
+        Account(String value) {
+            this._value = value;
+        }
+
+        @Override
+        @JsonValue
+        public String toString() {
+            return this._value;
+        }
+    }
+
     private String clientId;
     private String clientSecret;
     private String username;
     private String password;
     private String token;
     private String scope;
     private String redirectUri;
+    private Account account;
+    private String referral;
+    private String layout;
 
     public String getRedirectUri() {
         return redirectUri;
@@ -151,4 +171,28 @@ public String getClientSecret() {
     public void setClientSecret(String clientSecret) {
         this.clientSecret = clientSecret;
     }
+
+    public Account getAccount() {
+        return account;
+    }
+
+    public void setAccount(Account account) {
+        this.account = account;
+    }
+
+    public String getReferral() {
+        return referral;
+    }
+
+    public void setReferral(String referral) {
+        this.referral = referral;
+    }
+
+    public String getLayout() {
+        return layout;
+    }
+
+    public void setLayout(String layout) {
+        this.layout = layout;
+    }
 }