code: def history(self):
          ''' show payment history
          '''
          url= 'https://coincheck.com/api/exchange/orders/transactions'
          headers = make_header(url,access_key=self.access_key,secret_key=self.secret_key)
          r = requests.get(url,headers=headers)
          return json.loads(r.textf history(self):
          ''' show payment history
          '''
          url= 'https://coincheck.com/api/exchange/orders/transactions'
          headers = make_header(url,access_key=self.access_key,secret_key=self.secret_key)
          r = requests.get(url,headers=headers)
          return json.loads(r.text)
docs: show payment history