> For the complete documentation index, see [llms.txt](https://apidocs.onekeypayments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://apidocs.onekeypayments.com/guides/getting-started/important-configurations.md).

# Important configurations

###  Whitelist IPs

Remember to ***include your IPs*** within the correct API's IP list, by simply entering the addresses manually.

{% hint style="success" %}
Pro-tip: you can insert an IP range if needed, like `192.168.1.0/24` and we will whitelist the whole range.
{% endhint %}

<figure><img src="/files/gm8Vrc9UKAg1oVJhpLEm" alt=""><figcaption></figcaption></figure>

### Configure default URLs

Is the section right below, you will find the default URL section.&#x20;

<figure><img src="/files/6ctKgMcF2beYepBjnEha" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="147.6796875">URL</th><th>Description</th></tr></thead><tbody><tr><td>Return URL</td><td>The Return URL is the address to which the user or system is redirected after completing the payment process in case of being redirected to one of checkout pages.</td></tr><tr><td>Refund URL</td><td>Whenever the status of a refund changes, we will send you an asynchronous notification to this URL.</td></tr><tr><td>Confirm URL</td><td>Whenever the status of a deposit changes, we will send you an asynchronous notification to this URL.</td></tr><tr><td>Withdrawal URL</td><td>Whenever the status of a payout changes, we will send you an asynchronous notification to this URL.</td></tr></tbody></table>

{% hint style="success" %}
Have in mind that this are default URLs and all of them can be overriden with specific URLs that can be included in the JSON request of the transaction. The default URLs will be used if no URL is declared in the API request.
{% endhint %}


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