You can register your account at https://stripe.com/en-my.
After that you can see your API keys at https://dashboard.stripe.com/apikeys.
Find Stripe Publishable Key and API Key on the page.
The full secret key is only appeared once. On the image above, the secret key is being trunked with dots (...). Make sure you have take note when it's first appeared. Otherwise you need to regenerate a new secret key.
Please refer here for more info: https://stripe.com/docs/keys
Go to https://orderla.my/admin/payment-gateways/stripe and enter those keys you obtain from Stripe's dashboard.
Click 'Update Change' after you enter the keys.
On form's edit mode, go to Payments tab. Tick the checkbox for 'Enable Stripe'. Then click 'Save'.