Dear Sir,
Hope you are doing well.
I understood your requirement about some 3rd party code in your shopify store which shows popup ads. I have rich experience in Shopify, PHP, Website design, CSS, Javascript, etc. I can start the work immediately now for you and can provide you perfect result for your requirements. I can complete your project in less time. Look forward to work and discuss more about this project with you.
Regards,
Shivam Kataria