@@ -1,5 +1,6 @@
 package com.github.scribejava.core.builder;
 
+import com.github.scribejava.core.builder.api.BaseApi;
 import com.github.scribejava.core.builder.api.DefaultApi10a;
 import com.github.scribejava.core.builder.api.DefaultApi20;
 import com.github.scribejava.core.model.OAuthConfig;
@@ -8,6 +9,7 @@
 import com.github.scribejava.core.model.SignatureType;
 import com.github.scribejava.core.oauth.OAuth10aService;
 import com.github.scribejava.core.oauth.OAuth20Service;
+import com.github.scribejava.core.oauth.OAuthService;
 import com.github.scribejava.core.utils.Preconditions;
 
 abstract class AbstractServiceBuilder<T extends AbstractServiceBuilder<T>> {
@@ -176,22 +178,12 @@ public String getResponseType() {
     protected abstract OAuthConfig createConfig();
 
     /**
-     * Returns the fully configured {@link OAuth10aService}
+     * Returns the fully configured {@link S}
      *
      * @param api will build Service for this API
-     * @return fully configured {@link OAuth10aService}
+     * @return fully configured {@link S}
      */
-    public OAuth10aService build(DefaultApi10a api) {
-        return api.createService(createConfig());
-    }
-
-    /**
-     * Returns the fully configured {@link OAuth20Service}
-     *
-     * @param api will build Service for this API
-     * @return fully configured {@link OAuth20Service}
-     */
-    public OAuth20Service build(DefaultApi20 api) {
+    public <S extends OAuthService> S build(BaseApi<S> api) {
         return api.createService(createConfig());
     }
 }
@@ -0,0 +1,9 @@
+package com.github.scribejava.core.builder.api;
+
+import com.github.scribejava.core.model.OAuthConfig;
+import com.github.scribejava.core.oauth.OAuthService;
+
+
+public interface BaseApi<T extends OAuthService> {
+	T createService(OAuthConfig config);
+}
@@ -30,7 +30,7 @@
  * fine-tune the process. Please read the javadocs of the interfaces to get an idea of what to do.
  *
  */
-public abstract class DefaultApi10a {
+public abstract class DefaultApi10a implements BaseApi<OAuth10aService> {
 
     /**
      * Returns the access token extractor.
@@ -126,6 +126,7 @@ public Verb getRequestTokenVerb() {
      */
     public abstract String getAuthorizationUrl(OAuth1RequestToken requestToken);
 
+    @Override
     public OAuth10aService createService(OAuthConfig config) {
         return new OAuth10aService(this, config);
     }
 
@@ -22,7 +22,7 @@
  * fine-tune the process. Please read the javadocs of the interfaces to get an idea of what to do.
  *
  */
-public abstract class DefaultApi20 {
+public abstract class DefaultApi20 implements BaseApi<OAuth20Service> {
 
     /**
      * Returns the access token extractor.
@@ -88,6 +88,7 @@ public String getAuthorizationUrl(OAuthConfig config, Map<String, String> additi
         return authUrl;
     }
 
+    @Override
     public OAuth20Service createService(OAuthConfig config) {
         return new OAuth20Service(this, config);
     }
Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,7 @@`
`30`	`30`	`* fine-tune the process. Please read the javadocs of the interfaces to get an idea of what to do.`
`31`	`31`	`*`
`32`	`32`	`*/`
`33`		`-public abstract class DefaultApi10a {`
	`33`	`+public abstract class DefaultApi10a implements BaseApi<OAuth10aService> {`
`34`	`34`
`35`	`35`	`/**`
`36`	`36`	`* Returns the access token extractor.`
`@@ -126,6 +126,7 @@ public Verb getRequestTokenVerb() {`
`126`	`126`	`*/`
`127`	`127`	`public abstract String getAuthorizationUrl(OAuth1RequestToken requestToken);`
`128`	`128`
	`129`	`+ @Override`
`129`	`130`	`public OAuth10aService createService(OAuthConfig config) {`
`130`	`131`	`return new OAuth10aService(this, config);`
`131`	`132`	`}`
Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,7 @@`
`22`	`22`	`* fine-tune the process. Please read the javadocs of the interfaces to get an idea of what to do.`
`23`	`23`	`*`
`24`	`24`	`*/`
`25`		`-public abstract class DefaultApi20 {`
	`25`	`+public abstract class DefaultApi20 implements BaseApi<OAuth20Service> {`
`26`	`26`
`27`	`27`	`/**`
`28`	`28`	`* Returns the access token extractor.`
`@@ -88,6 +88,7 @@ public String getAuthorizationUrl(OAuthConfig config, Map<String, String> additi`
`88`	`88`	`return authUrl;`
`89`	`89`	`}`
`90`	`90`
	`91`	`+ @Override`
`91`	`92`	`public OAuth20Service createService(OAuthConfig config) {`
`92`	`93`	`return new OAuth20Service(this, config);`
`93`	`94`	`}`