Rename and remove refs to "gateway"

Author: clairekinde11

src/content/docs/billing/payment-management/payment-gateway.mdx renamed to src/content/docs/billing/payment-management/payment-processor.mdx

@@ -1,19 +1,19 @@
 ---
 page_id: acdd8b64-d5b7-43ab-b47b-6244d8f5b82e
-title: Connect payment gateway
+title: Connect payment processor (Stripe)
 sidebar:
   order: 1
   relatedArticles:
     - d980a089-d9c1-447b-930a-de0f2c00d3bf
 ---
 
-Kinde’s billing feature comes with a dependency on third party payment gateways. These services hold credit card details, process payments, apply tax, and generally handle all the financial side of billing.
+Kinde’s billing feature comes with a dependency on third party payment processor, specifically [Stripe Billing](https://stripe.com/au/billing). A payment processor holds credit card details, processes payments, applies tax, and generally handles all the financial side of billing.
 
 For now, only [Stripe](https://stripe.com), a known and reliable payments processing platform, is supported. A new Stripe account is automatically created for you when you set up billing in Kinde. 
 
 <Aside type="warning">
 
-You can’t currently connect your existing Stripe account, but you will be able to copy across your business information from your existing account to the new account. This is a Stripe-imposed limitation for third party payment gateway integrations. We’re working on a migration strategy.
+You can’t currently connect your existing Stripe account, but you will be able to copy across your business information from your existing account to the new account. This is a Stripe-imposed limitation for third party integrations. We’re working on a migration strategy.
 
 </Aside>