> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blnkfinance.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Practical Applications of Hooks
> Explore examples of how Hooks can be used in Blnk.
export const CtaCallout = props => {
const {title, buttonLabel, href, trackingEvent, buttonTarget, rel = "noopener noreferrer", children} = props;
const handleCtaClick = () => {
if (typeof window === "undefined" || !trackingEvent) {
return;
}
try {
window.dispatchEvent(new CustomEvent("blnk:docs-cta", {
detail: {
name: trackingEvent,
href
}
}));
} catch {}
try {
window.posthog?.capture?.(trackingEvent, {
href
});
} catch {}
const gaPayload = {
cta_href: href
};
try {
window.gtag?.("event", trackingEvent, gaPayload);
} catch {}
try {
window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
event: trackingEvent,
...gaPayload
});
} catch {}
};
const isExternal = typeof href === "string" && (/^https?:\/\//i).test(href);
const target = buttonTarget ?? (isExternal ? "_blank" : undefined);
const linkRel = isExternal ? rel : undefined;
return ;
};
***
## Fraud detection & risk assessment
* **Type:** `PRE_TRANSACTION`
* **Scenario:**
* Before approving a transaction, a pre-transaction hook triggers an external fraud detection system.
* The fraud detection system analyzes transaction patterns and generates a risk score.
* If the risk score exceeds a predetermined threshold, the transaction is either flagged for manual review or automatically rejected.
* **Benefit:** This process minimizes fraudulent transactions while ensuring legitimate transactions are unaffected.
***
## Customer due diligence & KYC checks
* **Type:** `PRE_TRANSACTION`
* **Scenario:**
* When a high-value transaction is initiated, a pre-transaction hook activates an external identity verification system.
* The system provides verification details, such as KYC compliance status and risk category.
* If the user is not verified, the transaction is halted, and a manual review is initiated.
* **Benefit:** This ensures regulatory compliance and prevents fraudulent transactions.
***
## Dynamic transaction enrichment
* **Type:** `PRE_TRANSACTION`
* **Scenario:**
* A pre-transaction hook retrieves additional metadata for a transaction before it is processed.
* For example, it enhances payment transactions with geolocation data or customer segmentation tags.
* This can be achieved by calling a metadata enrichment endpoint:
```bash cURL wrap theme={"system"}
curl -X POST http://YOUR_BLNK_INSTANCE_URL//metadata \
-H "X-Blnk-Key: " \
-H "Content-Type: application/json" \
-d '{
"meta_data": {
"last_name": "Brooks",
"verification_status": "Pending"
}
}'
```
```typescript TypeScript wrap theme={"system"}
const response = await blnk.Metadata.update(
'{id}',
{
meta_data: {
last_name: 'Brooks',
verification_status: 'Pending',
},
},
);
```
```go Go wrap theme={"system"}
meta, resp, err := client.Metadata.UpdateMetadata(
"{id}",
blnkgo.UpdateMetaDataRequest{
MetaData: blnkgo.MetaData{
"last_name": "Brooks",
"verification_status": "Pending",
},
},
)
```
```python Python wrap theme={"system"}
response = blnk.metadata.update(
"{id}",
{
"meta_data": {
"last_name": "Brooks",
"verification_status": "Pending",
},
},
)
```
```java Java wrap theme={"system"}
ApiResponse response = blnk.metadata().update(
"{id}",
UpdateMetadataData.create()
.metaData(Map.of(
"last_name", "Brooks",
"verification_status", "Pending"
)));
```
```json Response theme={"system"}
{
"meta_data": {
"last_name": "Brooks",
"verification_status": "Pending"
}
}
```
* **Benefit:** Enhances transaction data without altering the core system logic.
***
## Loyalty points & rewards processing
* **Type:** `POST_TRANSACTION`
* **Scenario:**
* After a successful transaction, a post-transaction hook triggers a loyalty system to award reward points.
* The system updates the user’s loyalty points based on the transaction value.
* If the user reaches a milestone, an automated reward is triggered.
* **Benefit:** Ensures financial accuracy and prevents mismatches.
***
## Real-time reconciliation & settlement
* **Type:** `POST_TRANSACTION`
* **Scenario:**
* A post-transaction hook sends transaction details to an external reconciliation service.
* The system cross-checks balances, payments, and pending transactions.
* Any discrepancies trigger alerts for manual intervention.
* **Benefit:** Ensures financial accuracy and prevents mismatches.
***
## Need help?
We are very happy to help you make the most of Blnk, regardless of whether it is your first time or you are switching from another tool.
To ask questions or discuss issues, please [contact us](mailto:support@blnkfinance.com) or [join our Discord community](https://discord.gg/7WNv94zPpx).
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