Broken Promises Flow

Different behaviour has been noted with the promise returned, when a callback is passed to the api function.

eg.

const instance = new Razorpay({
  key_id: 'rzp_test_2mYdwI91aUdL2u',
  key_secret: 'hd0FgTKnZUUJCGYHTdfQ6Zx2'
});

instance.payments.all({})
  .then((arg) => console.log(arg)) // arg value is printed  
  .catch(arg => console.log(arg))

instance.payments.all({}, function () {
  console.log(arguments); // arguments are printed
}).then((arg) => console.log(arg)) // arg value is undefined 
  .catch(arg => console.log(arg))