Thanks for posting. I hope your day is going well!
I understand you are looking to use Jazzcash as the payment gateway for your store. Unfortunately, this is not a supported gateway on Shopify. I recommend taking a look at the payment gateway options available in Pakistan that are supported by Shopify. You can access thatlist here.
In the meantime, as it sounds like you are new to the platform, I recommend checking out our Launch Checklist! This will ensure you have covered all your bases before launch day and don’t miss a step.