Paypal Standard shopping cart no longer working

I am running version 1.5.1.3 of Opencart.
My Paypal Standard extension no longer works

Paypal have replied:

***
Dear KJ,
There should be a way to modify the parameters within an OpenCart module, it shouldn't be a big problem to fix it.
Please let me know if you are able to do it.
Please, don't hesitate to contact us if you have further questions or issues or checkout the MTS forum - https://www.paypal-community.com/t5/Mer ... t/ct-p/mts
Regards,
Gabrielle
Merchant Technical Support
PayPal

***

Can anybody fix my problem ?

Please advise

Many Thanks
KJ

Hello KJ,

Have sent you the PM. Please check.
and please join me on Skype: cis.am3 for detail discussion

Regards,
Frank J

Hello KJ,
Please check your PM, I am available to help you.

Thanks,
Shivank Agrawal
skype: anaisys.technologies
email: md@anaisystechnologies.com

Sounds like this problem:
https://www.antropy.co.uk/blog/opencart ... 17-update/

Feel free to get in touch for an estimate to fix: info@antropy.co.uk

Thanks,
Paul