getting this "SyntaxError: Unexpected token

Do you have a link to your site?

yes
https://www.spaarkyzz.com
all other payment method are working but when i am selecting atom payment gateway its giving me “SyntaxError: Unexpected token <“

Please help me

I have installed old version and new version both are giving me same error

website is in under construction mode

At least you know where the error is coming from. Are you using a plugin directly from Atom? If so, I would contact them and let them know about the error.

Yes they have given me plugin(atom payment gateway)
I already contacted to them and they are saying this error is not from our side our plugin is working fine.

Atom plugin will be returning a non-Json response. It needs to change the way it processing the payment and ensure it doesn’t just spit out HTML/errors during payment.

Please give me any update on this.
I am totally frustated

I don’t author your ‘atom’ gateway so I cannot really..

for errors i already put

define('WP_DEBUG', false);
error_reporting(0);
@ini_set('display_errors', 0);

from last 6 months when i am testing the website atom payment gateway was working fine but from last 10 days its given me error .

can you please tell me how i can fix it.

The above only hides errors. If the gateway outputs HTML you cannot stop it with the above method. The gateway needs an update.

But why its working fine earlier.
earlier also the payment gateway outputs HTML .

I tried with older version of woocommerce also and getting the same erro and after update also same error .If its from atom side then why it was working from last 6 months.

Gateways are supposed to return an array, not output HTML. WC 2.4 is more strict about this and should have been tested by the authors.

Thanks provider has solved the problem