enhance: add tooltips for technical terms and Check callout after demo

Author: MantisClone

use-cases/invoicing.mdx

@@ -9,9 +9,9 @@ description: "Create crypto invoices with automatic payment detection and reconc
 Bring instant, verifiable payments to your invoicing flow. Generate invoices in fiat or crypto, let customers pay in their preferred token across 9 EVM chains and 150+ currencies, and receive automatic reconciliation with on-chain payment detection - no manual tracking, no infrastructure overhead.
 
 **What you get:**
-- **Permanent records** - Invoices stored on IPFS create a tamper-proof audit trail
+- **Permanent records** - Invoices stored on <Tooltip tip="InterPlanetary File System - a distributed storage network for permanent data">IPFS</Tooltip> create a tamper-proof audit trail
 - **Multi-currency flexibility** - Invoice in USD, get paid in crypto with automatic conversion
-- **Instant reconciliation** - Every invoice automatically linked to its on-chain payment
+- **Instant reconciliation** - Every invoice automatically linked to its <Tooltip tip="Blockchain-recorded transaction verified by network validators">on-chain</Tooltip> payment
 - **Cross-chain support** - Accept payments across 9 networks in 150+ currencies
 - **Webhook automation** - Real-time payment confirmations for backend integration
 
@@ -47,6 +47,10 @@ Try the complete invoicing workflow with EasyInvoice:
 - Automatic payment detection
 - Real-time status updates via webhooks
 
+<Check>
+**Ready to integrate?** If EasyInvoice meets your needs, you can start using it immediately. For custom requirements, explore the integration options below.
+</Check>
+
 ## Integration Approaches
 
 <Info>
@@ -99,7 +103,7 @@ Not sure which approach fits your needs? [See our detailed comparison of integra
     - White-label ready
     - Full customization
     - Add fee layers
-    - Non-custodial architecture
+    - <Tooltip tip="Users maintain control of their funds - you never custody crypto">Non-custodial</Tooltip> architecture
 
     [API docs →](/api-features/create-requests)
   </Card>