add hr's and payments (#893)

Author: ciaranightingale

docs/onboarding/0 1 Platform Overview.mdx

@@ -24,6 +24,8 @@ Our tool suite accelerates your development workflow across the smart contract,
   alt="platform-overview"
 />
 
+<hr />
+
 ## Wallets
 
 Onboard, manage and authenticate users with thirdweb's wallet integrations.
@@ -46,6 +48,8 @@ Onboard, manage and authenticate users with thirdweb's wallet integrations.
 
 [Auth](/auth) is a developer SDK that lets you integrate passwordless **web3-native authentication and authorization** into your applications.
 
+<hr />
+
 ## Smart Contracts
 
 Smart contracts serve as the foundational building blocks for any decentralized application.
@@ -91,6 +95,8 @@ Our SDKs and Dashboard detect the [extensions](/solidity/extensions) or common E
 
 These features optimize performance and enhance developer experience when building decentralized applications.
 
+<hr />
+
 ## Infrastructure
 
 Connect your application to decentralized networks.
@@ -108,3 +114,7 @@ thirdweb's RPC Edge is a high-performance, scalable, and reliable RPC service th
 
 - [**Bundler**](/smart-wallet/infrastructure): bundle operations and execute transactions with [ERC-4337 smart accounts](/smart-wallet).
 - [**Paymaster**](/smart-wallet/infrastructure): Paymaster is a service that enables sponsored transactions with [ERC-4337 smart accounts](/smart-wallet).
+
+### Payments
+
+[Paper Checkouts](https://docs.withpaper.com/reference/checkouts-overview) delivers the easiest NFT checkout experience: a simple premise with deep complexity abstracted away from you and your buyers.