QPushButton()

Create button

              # Create a button in the window
              self.button = QPushButton('Show text', self)
              self.button.move(20,80)
              

Button click

              self.button.clicked.connect(self.on_click)
              

click function

              def on_click(self):
                  url = 'https://www.w3schools.com/python/demopage.php'
                  myobj = {'somekey': 'somevalue'}
                  x = requests.post(url, json = myobj)
                  print(x.text)