> 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="https://3790748257-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FT43PzcNjyZtWby9yrGd3%2Fuploads%2F9CohH3H1e60bDSR2cLyM%2Fimage.png?alt=media&amp;token=cdd25969-f15f-4576-83ff-f09e413f93f0" 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="https://3790748257-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FT43PzcNjyZtWby9yrGd3%2Fuploads%2FflRpqIIO7IIBjSzuyOeI%2Fimage.png?alt=media&amp;token=b51313b9-7ebb-40db-8265-2814a07b9427" 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)