https://www.reuters.com/article/us-china-cryptocurrency-pboc/china-urges-banks-alipay-to-crack-down-harder-on-cryptocurrencies-idUSKCN2DX0VE >SHANGHAI (Reuters) -China's central bank said on Monday it had recently summoned some banks and payment firms, including China Construction Bank and Alipay, urging them to crack down harder on cryptocurrency trading.