### Question:
OAuth2EndpointApi { public OAuth2AccessToken issueTokenUsingPOST(String grantType, String authorization, String code, String redirectUri, String refreshToken, String username, String password) throws ApiException { ApiResponse<OAuth2AccessToken> resp = issueTokenUsingPOST1WithHttpInfo(grantType, authorization, code, redirectUri, refreshToken, username, password); return resp.getData(); } OAuth2EndpointApi();  OAuth2EndpointApi(ApiClient apiClient); ApiClient getApiClient(); void setApiClient(ApiClient apiClient); com.squareup.okhttp.Call authorizeUsingPOSTCall(ClientVO clientVO, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); AuthCodeVO authorizeUsingPOST(ClientVO clientVO); ApiResponse<AuthCodeVO> authorizeUsingPOSTWithHttpInfo(ClientVO clientVO); com.squareup.okhttp.Call authorizeUsingPOSTAsync(ClientVO clientVO, final ApiCallback<AuthCodeVO> callback); com.squareup.okhttp.Call introspectTokenUsingPOSTCall(String token, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); ValidityVO introspectTokenUsingPOST(String token); ApiResponse<ValidityVO> introspectTokenUsingPOSTWithHttpInfo(String token); com.squareup.okhttp.Call introspectTokenUsingPOSTAsync(String token, final ApiCallback<ValidityVO> callback); com.squareup.okhttp.Call issueTokenUsingPOST1Call(String grantType, String authorization, String code, String redirectUri, String refreshToken, String username, String password, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); OAuth2AccessToken issueTokenUsingPOST(String grantType, String authorization, String code, String redirectUri, String refreshToken, String username, String password); ApiResponse<OAuth2AccessToken> issueTokenUsingPOST1WithHttpInfo(String grantType, String authorization, String code, String redirectUri, String refreshToken, String username, String password); com.squareup.okhttp.Call issueTokenUsingPOST1Async(String grantType, String authorization, String code, String redirectUri, String refreshToken, String username, String password, final ApiCallback<OAuth2AccessToken> callback); com.squareup.okhttp.Call revokeTokenUsingPOSTCall(String token, String authorization, final ProgressResponseBody.ProgressListener progressListener, final ProgressRequestBody.ProgressRequestListener progressRequestListener); Boolean revokeTokenUsingPOST(String token, String authorization); ApiResponse<Boolean> revokeTokenUsingPOSTWithHttpInfo(String token, String authorization); com.squareup.okhttp.Call revokeTokenUsingPOSTAsync(String token, String authorization, final ApiCallback<Boolean> callback);  }### Answer:
@Test public void issueTokenUsingPOST1Test() throws ApiException { String grantType = null; String authorization = null; String code = null; String redirectUri = null; String refreshToken = null; String username = null; String password = null; OAuth2AccessToken response = api.issueTokenUsingPOST(grantType, authorization, code, redirectUri, refreshToken, username, password); }