string(488) "https://intlmapi.alipay.com/gateway.do?service=create_forex_trade&partner=2088911918655025&_input_charset=UTF-8&sign_type=MD5&notify_url=https://liulingo.com/test-payment&return_url=https://liulingo.com/test-payment&currency=USD&product_code=NEW_OVERSEAS_SELLER&subject=LQNK&out_trade_no=1659961792&total_fee=0.12&refer_url=https://liulingo.com&trade_information={"business_type":"5","other_business_type":"academic_consultancy_and_tutoring"}&sign=6dbb3dc156cbec351306fb89d856f02c"