Hello,
Yes I have experienced in opencart and the etisalat payment gateway,
I have worked on etisalat payment gateway , and I have strong knoweldge of open cart ,
Please share with me your live website website ,
And Do worries about it ,
I have 8 year of experience in website development ,
I want to check your website ,
Please share with me ,
I am waiting for your positive response ,
Thank you