Paypal sandbox showing "Things don't appear to be working at the moment. Please try again later."

[anupam28]

Hi,

I am developing a website which uses PayPal as the payment gateway and I am using SandBox for testing. But when we are redirecting to Paypal URL it is showing this page and I am not getting redirected to login page. I am creating the Paypal URL as

 " string redirect = $"{actionUrl}cmd={cmd}&hosted_button_id={hostedButtonId}¬ify_url={notifyUrl}&return={returnUrl}&cancel_url={cancelUrl}¤cy_code={currencyCode}&email={email}&first_name={firstName}&last_name={lastName}&country={country}&lc={countryCode}&amount={custom}&on0=Selected Payment"; "

can you please check this and help me to proceed further.

Thank you in advance and waiting for your reply.

Regards,

anupam <removed>