# 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 %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://developers.klasha.com/accepting-payments/html-checkout.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.