Here are the instructions to use Stripe as your payment gateway for your Shopify store:
A- Login to your Shopify store.
B- Click Settings.
C- Click Payments.
D- In the Accept Credit Cards section select Shopify Payments.
E- Deactivate Shopify Payments.(When you deactivate shopify payment after then Stripe payment gateway will show)
F- Now select stripe payment .
G- Click Activate.
H- Click Complete account setup.
I- Enter the various details and submit.
Upon taking the steps above you’ll be able to accept credit card payments and, although Shopify Payments use Stripe, you won’t be able to view your Shopify Payments in the Stripe Dashboard.