> ## Documentation Index
> Fetch the complete documentation index at: https://signatureapi-daf4ee54.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Ceremony Customization

> Customize embedded signing appearance and behavior with URL query parameters

In addition to the customization options available when you create a ceremony, you can further customize the appearance and behavior of an embedded ceremony.

To do this, pass customization options as query parameters in the ceremony URL.

## Appearance

### Accent Color

You can set the accent color of the ceremony using the `accent_color` query parameter. The accent color appears in interface elements such as buttons and signature places. Make sure the color you choose is visible against a white document background.

The value must be a valid hexadecimal color code, without the `#` prefix. The default accent color is a shade of blue.

For example, to set the accent color to purple:

<div className="font-mono text-sm break-all">
  https:​//sign.signatureapi.com/en/start?token=eyJhbGci...iDsInR<span className="text-red-600 font-bold">\&accent\_color=8e24aa</span>
</div>

The ceremony will look like this:

<Frame>
  <img src="https://mintcdn.com/signatureapi-daf4ee54/to2kcqhpCDnABjF5/docs/embedded/purple.png?fit=max&auto=format&n=to2kcqhpCDnABjF5&q=85&s=883ae35b5bff5f17965f6397ff5b6cf3" alt="Ceremony UI with purple accent color" width="1594" height="994" data-path="docs/embedded/purple.png" />
</Frame>

## Behavior

### Disable Cancel

As a default, the ceremony allows the recipient to cancel the ceremony. You can disable this by setting the `allow_cancel` query parameter to `false`. You can do this to handle the cancellation in your application.

<div className="font-mono text-sm break-all">
  https:​//sign.signatureapi.com/en/start?token=eyJhbGci...iDsInR<span className="text-red-600 font-bold">\&allow\_cancel=false</span>
</div>

### Event Delivery

The ceremony can send events to your application. You can configure the event delivery method by setting the `event_delivery` query parameter to either `redirect` or `message`.

#### Javascript Messages

When you set `event_delivery=message`, the ceremony will send events to your application as a Javascript Message with a payload. This is useful when embedding in a web app using `<iframe>`.

<div className="font-mono text-sm break-all">
  https:​//sign.signatureapi.com/en/start?token=eyJhbGci...iDsInR<span className="text-red-600 font-bold">\&event\_delivery=message</span>
</div>

#### Redirects

When you set `event_delivery=redirect`, the ceremony will redirect to a URL with a query parameter that contains the event. This is useful when embedding in a desktop or mobile app using `WebView` or similar.

<div className="font-mono text-sm break-all">
  https:​//sign.signatureapi.com/en/start?token=eyJhbGci...iDsInR<span className="text-red-600 font-bold">\&event\_delivery=redirect</span>
</div>

Learn more about delivering events to your application in [Ceremony Events](/docs/embedded/ceremony-events).