# Smart Router Functionality
In this example, we will create a Smart Router instance that utilizes the [Transaction Size Strategy](#transaction-size-strategy-multi-selection). The following steps will demonstrate how to configure the Smart Router and define the criteria for selected MIDs, specifically `MPGS` and `Knet` MIDs.
### **Step 1: Create a Smart Router Instance**
Navigate to the **PGSR** (Smart Router section) in the **Administration Panel** and click on the **Add Smart Router** button. Fill in the required details as shown in the figure below:
**Smart Router Configuration:**
* **Name:** Smart Router Example
* **Is Active:** Yes
* **Code Identifier:** smart\_router\_example
* **Strategies:** Transaction Size Strategy
### **Step 2: Define Criteria for Selected MIDs**
Since we are using the [Transaction Size Strategy](#transaction-size-strategy-multi-selection), the criteria for this strategy must be defined for each selected MID. The figure below shows the criteria defined for `MPGS` and `Knet` MIDs:
**Knet MID Criteria:**
* **Minimum Amount:** 1
* **Maximum Amount:** 50
**MPGS MID Criteria:**
* **Minimum Amount:** 51
* **Maximum Amount:** 100
### **Step 3: Create a Checkout Link Using Checkout API**
Using the [Checkout API](broken://pages/w6x1vl3nTj166uTuqUyg), we will create a checkout link. Below is the payload request for creating the checkout link:
```json
{
"type": "payment_request",
"pg_codes": ["smart-router-example"],
"amount": "55",
"currency_code": "KWD"
}
```
The generated checkout link will redirect to the **Checkout Page** where the customer will click on the **Pay** button.
### **Step 4: Payment Processing with Smart Router**
Once the pay button is clicked, the Smart Router starts functioning to choose the best path between the two chosen MIDs (**MPGS** and **Knet**). The path selection is based on the defined criteria.
As shown in the figure below, the chosen MID is **MPGS** since the transaction amount is 55, which falls within the range of the defined **MPGS** criteria.
If we change the amount in the request payload to be 50.
```json
{
"type": "payment_request",
"pg_codes": ["smart-router-example"],
"amount": "50",
"currency_code": "KWD"
}
```
The Smart Router will choose Knet since the defined range covers the amount, as shown in the figure below:
**Conclusion**
By following these steps, we demonstrated how to create a Smart Router instance using the [Transaction Size Strategy](/ottu-team-sandbox-doc/user-guide-proposal/features/smart-router-engine/transaction-size-strategy-scenario.md) and defined criteria for `MPGS` and `Knet` MIDs. This example illustrates how the Smart Router dynamically selects the most appropriate payment gateway based on the transaction amount, optimizing the payment processing workflow and enhancing overall efficiency.
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