> For the complete documentation index, see [llms.txt](https://help.checkoutchamp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.checkoutchamp.com/crm/gateway-setup/gateway-integrations/merchant-warrior.md).

# Merchant Warrior

**STEP 1**

Go to **Merchants** → **Gateway Integrations** and activate the Merchant Warrior tile with the “**+ Activate**” button

<figure><img src="/files/kNgHihRszpz01iQY0v7b" alt=""><figcaption></figcaption></figure>

**STEP 2**

Enter the **merchantUuid, apiKey,** and **apiPassphrase** from your Merchant Warrior account. To enable 3DS transactions, set **Secure3DS** to “Yes.” Press the green “Create Gateway” button to create your Merchant Warrior gateway.

<figure><img src="/files/zknj6UKWIAgN11XoZzde" alt=""><figcaption></figcaption></figure>

**STEP 3**

Apply the gateway to your offers and upsells within the campaign.

{% hint style="info" %}
This next step can be ignored if using CheckoutChamp hosted pages
{% endhint %}

**Secure 3DS:**

If using native (challenge) 3DS, be sure to follow proper instructions on the checkout page

[Direct API 3DS Instructions](/crm/gateway-setup/direct-api-3ds-instructions.md)