get POST data on isRedirect()

[graytape]

$response = $gateway->purchase([
					'amount'        => $total,
					'currency'      => $store_currency,
					'description'   => 'Stripe payment',
					'paymentMethod' => $paymentMethodId,
					'returnUrl'     => $returnUrl",
					'confirm'       => true,
					'metadata'      => null,
		        ])->setItems($items)->send();

When $response->isRedirect() is true and I follow the redirect, how do I finalize the payment? And where do I get the data that I've sent?
Thanks

[vojtasvoboda]

Which gateway type? Stripe Charge, Stripe Payments Intents or Stripe Checkout?