# HTML Checkout
Sample implementation:
```html
Klasha Payment
```
### klashaClient Parameters
| Name | Description | Sample |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------- |
| merchantKey | Merchant Public Key | |
| businessId | Merchant businessId | 12 |
| amount | Paying amount.
It will be converted to the currency the customer is using if the source currency is different from the transaction currency.
| 1 |
| destinationCurrency | Merchant accepting current | USD |
| currency | Customer payment current | NGN |
| ENVIRONMENT | Mode to switch between development and production environment | true or false. (set to true in development and false in production) |
{% code title="More explanantion" overflow="wrap" fullWidth="false" %}
```bash
To effectively test a paid or failed transaction, it's important to include the callWhenDone() function in your kit. This function should look similar to the example provided above. It takes an argument that, when logged, will return a status object indicating either an ERROR or a successful transaction. You can then decide how to proceed based on this status.
If the user clicks the close button, the system assumes no action was taken, and it will return an ERROR status.
```
{% endcode %}