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Official Gyro-n Payments Java SDK
There is a newer version: 0.11.17
package jp.gopay.sdk.utils;

import jp.gopay.sdk.models.common.auth.AuthHeader;
import jp.gopay.sdk.models.common.auth.AuthStrategy;
import jp.gopay.sdk.models.common.auth.LoginJWTStrategy;
import jp.gopay.sdk.settings.AbstractSDKSettings;
import jp.gopay.sdk.types.AuthType;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class GoPayClient {
    public static final String AUTHORIZATION_HEADER_NAME = "Authorization";
    public static final String ORIGIN_HEADER_NAME = "Origin";

    public static OkHttpClient.Builder getDefaultClientBuilder(final AuthStrategy authStrategy, final AbstractSDKSettings settings) {

        return new OkHttpClient
                .Builder()
                .connectTimeout(settings.getTimeout(), TimeUnit.SECONDS)
                .readTimeout(settings.getTimeout(), TimeUnit.SECONDS)
                .writeTimeout(settings.getTimeout(), TimeUnit.SECONDS)
                .addInterceptor(
                    new Interceptor() {
                        @Override
                        public Response intercept(Chain chain) throws IOException {
                            Request original = chain.request();
                            Request.Builder requestBuilder = original.newBuilder();
                            AuthHeader authHeader = authStrategy.getAuthHeader();
                            if(!authHeader.getAuthType().equals(AuthType.NO_AUTH_HEADER)){
                                requestBuilder.addHeader(AUTHORIZATION_HEADER_NAME, authHeader.getValue());
                            }
                            if (!settings.getOrigin().isEmpty()) {
                                requestBuilder.addHeader(ORIGIN_HEADER_NAME, settings.getOrigin());
                            }

                            Request request = requestBuilder.build();
                            Response response = chain.proceed(request);

                            /*
                             * If the client is currently using a Login JWT for authentication, replace the soon-to-expire
                             * token with the refresh token sent by the API in the response's Authorization header.
                             */
                            if(LoginJWTStrategy.class.isInstance(authStrategy)){
                                List refreshTokenHeader = response.headers(AUTHORIZATION_HEADER_NAME);
                                if(!(refreshTokenHeader == null || refreshTokenHeader.isEmpty())){
                                    String refreshToken = AuthHeader.parseValueFromJWTHeader(refreshTokenHeader.get(0));
                                    ((LoginJWTStrategy)authStrategy).refresh(refreshToken);
                                }
                            }

                            return response;
                        }
                    }
        );
    }
}