Virtual agents (non-Zoom) messaging protocol reference

HTTP protocol reference for integrating virtual agents (non-Zoom) with Zoom Contact Center. This protocol defines the message format and endpoints that virtual agent providers implement to support action and trigger mode integration.

The integration enables virtual agents (non-Zoom) to act as AI agents within Zoom Contact Center, handling conversation messages, rich media content, and handover to live agents.

For the full integration workflow and Marketplace app setup, see Integrate virtual agents (non-Zoom) with actions and triggers.

Send messages to the virtual agent

To send messages from Zoom Contact Center to your virtual agent endpoint, Zoom sends HTTP requests with the following payload structure.

Request payload

Start conversation
Consumer input
Card/quick reply submission
Form submission
End conversation
{
    "id": "xxx",
    "sessionId": "xxx",
    "conversationMode": "START_CONVERSATION",
    "message": {
        "type": "text",
        "value": "hi"
    },
    "conversationVariables": {
        "global_system.Engagement.timezone": "America/New_York",
        "global_system.Engagement.regionCode": "GA",
        "global_system.Consumer.email": "a@q.com",
        "global_system.Engagement.latLong": "34.0409, -84.0237",
        "global_custom.CustomerVariableGroup.QueueOpenHours": "1698872160000",
        "global_custom.CustomerVariableGroup.CVariable001": "this is default value",
        "global_system.Engagement.locale": "en-us",
        "global_custom.Website_Data_Value.GJavescriptVariable_hostname": "localhost",
        "global_system.Engagement.regionName": "Georgia",
        "global_system.Engagement.cityName": "Suwanee"
    },
    "languageCode": "en-US",
    "additionalPayload": null,
    "timestamp": 111,
    "userId": "xxx",
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}
{
    "id": "xxx",
    "sessionId": "xxx",
    "conversationMode": "KEEP_CONVERSATION",
    "conversationVariables": {},
    "additionalPayload": null,
    "languageCode": "en-US",
    "message": {
        "type": "text",
        "value": "Hi, I need some help!"
    },
    "timestamp": 111,
    "userId": "xxx",
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}
{
    "id": "xxx",
    "sessionId": "xxx",
    "conversationMode": "KEEP_CONVERSATION",
    "message": {
        "type": "text",
        "value": "yes"
    },
    "conversationVariables": {},
    "additionalPayload": {
        "action": "optionSubmit",
        "data": {
            "interactionId": "a806116e-5301-4b0c-b448-cc09c32ed72a-0fffcb44",
            "interacted": true,
            "value": "yes",
            "originMessage": {
                "type": "quickReplies",
                "value": {
                    "title": "Please make your choice",
                    "options": [
                        {
                            "label": "Yes",
                            "value": "yes"
                        },
                        {
                            "label": "No",
                            "value": "no"
                        }
                    ]
                }
            }
        }
    },
    "languageCode": "en-US",
    "timestamp": 111,
    "userId": "xxx",
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}
{
    "id": "xxx",
    "sessionId": "xxx",
    "conversationMode": "KEEP_CONVERSATION",
    "message": {
        "type": "text",
        "value": "info_collection_form(form name)"
    },
    "conversationVariables": {},
    "additionalPayload": {
        "action": "formSubmit",
        "data": {
            "interactionId": "a806116e-5301-4b0c-b448-cc09c32ed72a-0fffcb44",
            "skipped": false,
            "values": [
                {
                    "key": "name",
                    "type": "text",
                    "value": "Tom"
                },
                {
                    "key": "education",
                    "type": "select",
                    "value": "bachelor"
                },
                {
                    "key": "option",
                    "type": "multi-select",
                    "value": ["1", "2"]
                }
            ],
            "originMessage": {
                "type": "form",
                "value": {
                    "title": "your title",
                    "description": "<p>I really like using Markdown.</p> ",
                    "fields": [
                        {
                            "type": "text",
                            "label": "Name",
                            "key": "name",
                            "required": true,
                            "defaultValue": ""
                        },
                        {
                            "type": "select",
                            "label": "Education",
                            "key": "education",
                            "required": true,
                            "options": [
                                {
                                    "label": "High School Diploma",
                                    "value": "high_school"
                                },
                                {
                                    "label": "Associate Degree",
                                    "value": "associate"
                                },
                                {
                                    "label": "Bachelor's Degree",
                                    "value": "bachelor"
                                },
                                {
                                    "label": "Doctoral Degree (Ph.D.)",
                                    "value": "doctor"
                                },
                                {
                                    "label": "Other",
                                    "value": "other"
                                }
                            ],
                            "defaultValue": ""
                        },
                        {
                            "type": "multi-select",
                            "label": "Make you chocie",
                            "key": "option",
                            "required": true,
                            "options": [
                                {
                                    "label": "Option1",
                                    "value": "1"
                                },
                                {
                                    "label": "Option2",
                                    "value": "2"
                                },
                                {
                                    "label": "Option3",
                                    "value": "3"
                                }
                            ],
                            "defaultValues": ["1", "2"]
                        }
                    ]
                }
            }
        }
    },
    "languageCode": "en-US",
    "timestamp": 111,
    "userId": "xxx",
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}
{
    "id": "xxx",
    "sessionId": "xxx",
    "conversationMode": "END_CONVERSATION",
    "timestamp": 111,
    "userId": "xxx",
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}

Request parameters

Parameter Name	Type	Required	Description	Possible Values
id	String	Yes	Unique identifier for this request.
sessionId	String	Yes	Unique identifier for the virtual agent conversations.
conversationMode	String	Yes	Parameter to define whether to start a new conversion, continue with the existing, or close the conversation. `START_CONVERSATION`: starts a session `KEEP_CONVERSATION`: keeps the current session. `END_CONVERSATION`: ends the current session	`START_CONVERSATION`, `KEEP_CONVERSATION`, `END_CONVERSATION`
conversationVariables	Object	No	Will be sent only once when `conversationMode` is `START_CONVERSATION`. Include both system-defined and customer-defined values. Virtual agent providers should store these variables within the conversation context so that customers can reference within the virtual agent's flow.
additionalPayload	Object	No	For submissions of forms, cards, action cards, or quick replies, the data will be placed in the `additionalPayload` field. Note: `additionalPayload` may be null if the consumer's input is not related to any of these rich media selections.
languageCode	String	Yes	Required when `conversationMode` is `START_CONVERSATION` or `KEEP_CONVERSATION`.	`en-US`
message	Object	Yes	Details of the message to be sent. Required when `conversationMode` is `START_CONVERSATION` or `KEEP_CONVERSATION`.
timestamp	Long	Yes	Unix epoch time when the message was sent from the end-user of the chat client.
userId	String	Yes	Unique user identifier. This is the identifier of the end-user who is interacting with the virtual agent.
customData	Object	Yes	Pass-through JSON-formatted name-value pairs that are sent back in the response. These values are not processed by the endpoint, but can be used to keep specific customer information attached to the conversation.

Message input types

Text

To handle plain text messages from consumers, parse the message object.

{
    "type": "text",
    "value": "Hi, I need some help!"
}

Field	Required	Value	Description	Limitation
value	Yes	String	Plain text	n/a

Receive messages from the virtual agent

To respond with messages from your virtual agent to Zoom Contact Center, return HTTP responses with the following payload structure.

Response payload

Basic response example.

{
    "id": "xxx",
    "sessionId": "xxx",
    "body": [
        {
            "type": "text",
            "value": "Hi, I'm your virtual agent!"
        }
    ],
    "timestamp": 111,
    "userId": "xxx",
    "completed": false,
    "customData": {
        "trackingId": "xxx",
        "engagmentId": "xxx"
    }
}

Response parameters

Parameter Name	Type	Required	Description	Possible Values
id	String	Yes	Unique identifier for this request.
sessionId	String	No	Unique identifier for the virtual agent conversations.
body	Array	Yes	List of objects that describe the elements of the response message body.
timestamp	Long	Yes	Unix epoch time when the message was sent from the end-user of the chat client.
userId	String	Yes	Unique user identifier. This is the identifier of the end-user who is interacting with the virtual agent.
completed	Boolean	No	Flag that indicates whether the virtual agent has successfully completed the conversation. `true` means conversation has been successfully completed. `false` means conversation is not complete and this parameter is not returned in the response.	`true`, `false`
customData	Object	Yes	Pass-through JSON-formatted name-value pairs that are sent back in the response. These values are not processed by the endpoint, but can be used to keep specific customer information attached to the conversation.

Message body structure

Each message in the body array contains a type and value.

Field	Required	Value	Description	Possible Values
type	Yes	String	Message content type.	`action`, `text`, `html`, `markdown`, `quickReplies`, `card`, `carousel`, `article`, `image`, `audio`, `video`, `link`, `form`, `attachment`
value	Yes	Object	Refer to the message content types below.
fallbackText	No	String	When a virtual agent is integrated with social channels such as Facebook or WhatsApp, these platforms may not fully support rich text messages. Setting a `fallbackText` helps ensure that users can still see a message instead of receiving no prompt at all.

Message content types

Action

To trigger actions in the conversation, use action messages.

Set variables

To dynamically route to queues, set variables in the conversation context.

{
    "type": "action",
    "value": {
        "action": "setVariables",
        "data": {
            "variables": [
                {
                    "name": "global_custom.dynamic routing.dynamical_queue",
                    "value": "Main Team Queue"
                }
            ]
        }
    }
}

Typing indicator

To display a typing indicator, send a typing action.

{
    "type": "action",
    "value": {
        "action": "typing",
        "data": {
            "typingTime": 1000
        }
    }
}

Field	Required	Value	Description	Limitation
typingTime	No	long	Typing indicator display duration in milliseconds. If not specified, the default maximum display time is 5 seconds.	n/a

Transfer to live agent

To transfer the conversation to a live agent, send a transfer action.

{
    "type": "action",
    "value": "TransferToLiveAgent"
}

Article

To send an article with content and sources, use the article type.

{
    "type": "article",
    "value": {
        "title": "How Zoom can help you stay safe in cyberspace",
        "content": "<!DOCTYPE html><html><head><style>body {background-color: powderblue;}h1   {color: blue;}p    {color: red;}</style></head><body><h1>This is a heading</h1><p>This is a paragraph.</p></body></html>",
        "style": "multi-sources",
        "sources": [
            {
                "label": "reference 1",
                "title": "this is reference 1",
                "content": "<!DOCTYPE html><html><head><style>body {background-color: powderblue;}h1   {color: blue;}p    {color: red;}</style></head><body><h1>This is a heading</h1><p>This is a paragraph.</p></body></html>",
                "contentType": "markdown",
                "url": "https://www.zoom.com/en/blog/how-zoom-can-help-you-stay-safe-in-cyberspace/"
            },
            {
                "label": "reference 2",
                "title": "this is reference 2",
                "contentType": "html",
                "content": "<!DOCTYPE html><html><head><style>body {background-color: powderblue;}h1   {color: blue;}p    {color: red;}</style></head><body><h1>This is a heading</h1><p>This is a paragraph.</p></body></html>",
                "url": "https://www.zoom.com/en/blog/how-zoom-can-help-you-stay-safe-in-cyberspace/"
            }
        ]
    }
}

Field	Required	Value	Description	Limitation
title	Yes	String	Article title	256 Bytes
content	Yes	String	Standard HTML format or plain text	n/a
sources	Yes	List	List of article sources	20
style	No	String	Source display style: `single-source`, `multi-sources`	n/a

Article source

To add source references to an article, include source objects.

Field	Required	Value	Description	Limitation
label	Yes	String	The button or label name	128 Bytes
title	Yes	String	The title in the details	256 Bytes
content	Yes	String	Standard HTML format or plain text	n/a
contentType	No	String	Content format type: `markdown` or `html`	n/a
url	No	String	The article link	n/a
openNewTab	No	Boolean	The URL will open in new tab	n/a

Attachment

To send a file attachment, use the attachment type.

{
    "type": "attachment",
    "value": {
        "title": "attachment pdf title",
        "name": "attachment pdf name.pdf",
        "url": "https://file-examples.com/storage/fe091522ae6912e509be331/2017/10/file-sample_150kB.pdf"
    }
}

Field	Required	Value Type	Description
title	Yes	String	Attachment title
url	Yes	String	Attachment URL
name	Yes	String	Attachment filename

Audio

To send an audio file, use the audio type.

{
    "type": "audio",
    "value": {
        "title": "This is a title",
        "name": "audio name",
        "url": "https://youtube.com/123456"
    }
}

Field	Required	Value	Description	Limitation
url	Yes	String	Audio URL	n/a
title	No	String	Audio title	128 Bytes
name	No	String	Audio name	128 Bytes

Card

To send a card with an image, description, and action buttons, use the card type.

{
    "type": "card",
    "value": {
        "title": "card title",
        "description": "This text is **bold**.",
        "imageUrl": "https://static-st1.zoomdev.us/static/6.3.34762/image/new/topNav/Zoom_logo.svg",
        "options": [
            {
                "type": "option",
                "label": "Select case 1",
                "value": "case1"
            },
            {
                "type": "link",
                "label": "More",
                "value": "https://example.com/link"
            }
        ]
    }
}

Field	Required	Value	Description	Limitation
title	No	String	Card title	256 Bytes
description	No	String	Standard Markdown format	4096 Bytes
imageUrl	Yes	String	Image URL	n/a
options	Yes	List	List of card options	20
mandatory	No	Boolean	If true, and the options list contains at least one option type item (button), the live chat client will disable the input box if the button is not clicked. Default: false	n/a

Card option types

Option button

To add an option button to a card, use type option.

Field	Required	Value	Description	Limitation
type	Yes	String	`option`
label	Yes	String	Display name	128 Bytes
value	Yes	String	The identified value	n/a

Link button

To add a link button to a card, use type link.

Field	Required	Value	Description	Limitation
type	Yes	String	`link`
label	Yes	String	Display name	128 Bytes
value	Yes	String	URL	n/a

Carousel

To send multiple cards in a carousel, use the carousel type.

{
    "type": "carousel",
    "value": {
        "cards": [
            {
                "title": "carousel title 1",
                "description": "This is the first item.",
                "imageUrl": "https://images.unsplash.com/photo-1682685794304-99d3d07c57d2?ixlib=rb-4.0.3&ixid=M3wxMjA3fDF8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=772&q=80",
                "options": [
                    {
                        "type": "option",
                        "label": "Select case 1",
                        "value": "case1"
                    },
                    {
                        "type": "link",
                        "label": "More",
                        "value": "https://example.com/link"
                    }
                ]
            },
            {
                "title": "carousel title 2",
                "description": "This is the second item.",
                "imageUrl": "https://plus.unsplash.com/premium_photo-1691852519415-0df4c22e49e1?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=774&q=80",
                "options": [
                    {
                        "type": "option",
                        "label": "Select case 1",
                        "value": "case1"
                    },
                    {
                        "type": "link",
                        "label": "More",
                        "value": "https://example.com/link"
                    }
                ]
            }
        ]
    }
}

Field	Required	Value	Description	Limitation
cards	Yes	List	List of card objects with the same structure as the card type	10

Form

To collect information from consumers through a form, use the form type.

{
    "type": "form",
    "value": {
        "name": "form name",
        "title": "form title",
        "subtitle": "I really like it ",
        "fields": [
            {
                "type": "text",
                "label": "Name",
                "key": "name",
                "required": true,
                "defaultValue": "name"
            },
            {
                "type": "single-select",
                "label": "Education",
                "key": "education",
                "required": true,
                "options": [
                    {
                        "label": "High School Diploma",
                        "value": "high_school"
                    },
                    {
                        "label": "Other",
                        "value": "other"
                    }
                ],
                "defaultValue": "high_school"
            },
            {
                "type": "multi-select",
                "label": "Make you chocie",
                "key": "option",
                "required": true,
                "options": [
                    {
                        "label": "Option1",
                        "value": "1"
                    },
                    {
                        "label": "Option2",
                        "value": "2"
                    },
                    {
                        "label": "Option3",
                        "value": "3"
                    }
                ],
                "defaultValue": ["1", "2"]
            }
        ]
    }
}

Field	Required	Value	Description	Limitation
name	No	String	Form name
title	No	String	Form title	256 Bytes
subtitle	No	String	Form subtitle	1024 Bytes
mandatory	No	Boolean	If true, and the field list contains at least one field element, the live chat client will disable the input box before the form has been submitted. Default: false. Note: Works with livechat SDK only.
fields	Yes	List	List of form fields

Text input field

To add a text input field to a form, use the text field type.

{
    "type": "text",
    "label": "Name",
    "key": "name",
    "required": true,
    "defaultValue": "",
    "pattern": "text"
}

Field	Required	Value	Description	Limitation
label	Yes	String	Field label	128 Bytes
key	Yes	String	Field key	64 Bytes
required	No	Boolean	Whether field is required
defaultValue	No	String	Default value	256 Bytes
pattern	No	String	Validation pattern: `text` (no rule) `email` (must be in email address format) `integer` (require input of positive integers) `decimal` (require decimal input) `custom` (use the regex set in field customRegex to do the validation). Default: text
customRegex	No	String	Regular expression for custom pattern validation	128 characters
errorLabel	No	String	The error message to show while the data is invalid	128 characters

Select field

To add a single-select dropdown to a form, use the single-select field type.

{
    "type": "single-select",
    "label": "Education",
    "key": "education",
    "required": true,
    "options": [
        {
            "label": "High School Diploma",
            "value": "high_school"
        },
        {
            "label": "Associate Degree",
            "value": "associate"
        },
        {
            "label": "Bachelor's Degree",
            "value": "bachelor"
        },
        {
            "label": "Doctoral Degree (Ph.D.)",
            "value": "doctor"
        },
        {
            "label": "Other",
            "value": "other"
        }
    ],
    "defaultValue": ""
}

Field	Required	Value	Description	Limitation
label	Yes	String	Field label	128 Bytes
key	Yes	String	Field key	128 Bytes
required	No	Boolean	Whether field is required
defaultValue	No	String	Default option value
options	Yes	List	List of select options

Select option

Each option in a select field has the following structure.

{
    "label": "Male",
    "value": "male"
}

Field	Required	Value	Description	Limitation
label	Yes	String	Display name	128 Bytes
value	Yes	String	The identify value	128 Bytes

Multi-select field

To add a multi-select dropdown to a form, use the multi-select field type.

{
    "type": "multi-select",
    "label": "Make you chocie",
    "key": "option",
    "required": true,
    "options": [
        {
            "label": "Option1",
            "value": "1"
        },
        {
            "label": "Option2",
            "value": "2"
        },
        {
            "label": "Option3",
            "value": "3"
        }
    ],
    "defaultValues": ["1", "2"]
}

Field	Required	Value	Description	Limitation
label	Yes	String	Field label	128 Bytes
key	Yes	String	Field key	64 Bytes
required	No	Boolean	Whether field is required
defaultValue	No	List	Default option values
options	Yes	List	List of select options

Multi-select option

Each option in a multi-select field has the following structure.

{
    "label": "Male",
    "value": "male"
}

Field	Required	Value	Description	Limitation
label	Yes	String	Display name	128 Bytes
value	Yes	String	The identify value. Only strings consisting of a-z and 0-9 are allowed.	64 Bytes

HTML

To send HTML-formatted messages, use the html type.

{
    "type": "html",
    "value": "<!DOCTYPE html><html><head><title>Page Title</title></head><body><h1>HTML message</h1><a href=\"https://zoom.com\">Zoom</a><p><b>Please type your query below</b></p></body></html>"
}

Field	Required	Value	Description	Limitation
value	Yes	String	Standard HTML format	n/a

Image

To send an image, use the image type.

{
    "type": "image",
    "value": {
        "title": "image title",
        "width": 300,
        "height": 200,
        "name": "zoom_logo",
        "altText": "This is a logo",
        "url": "https://zoom.us/logo.jpeg"
    }
}

Field	Required	Value Type	Description	Limitation
url	Yes	String	Image URL	n/a
width	No	Number	Image width	n/a
height	No	Number	Image height	n/a
name	No	String	Image name	128 Bytes
altText	No	String	Text displayed when hovering the mouse	128 Bytes

Link

To send a link, use the link type.

{
    "type": "link",
    "value": {
        "label": "link name",
        "url": "https://zoom.us"
    }
}

Field	Required	Value	Description	Limitation
url	Yes	String	Link URL	n/a
label	No	String	Link label	128 Bytes

Markdown

To send Markdown-formatted messages, use the markdown type.

{
    "type": "markdown",
    "value": "## This text is **bold**."
}

Field	Required	Value	Description	Limitation
value	Yes	String	Standard Markdown format	n/a

Quick replies

To provide quick reply buttons for consumer responses, use the quickReplies type.

{
    "type": "quickReplies",
    "value": {
        "title": "Please make your choice",
        "options": [
            {
                "label": "Yes",
                "type": "postback",
                "value": "yes"
            },
            {
                "label": "No",
                "type": "postback",
                "value": "no"
            }
        ],
        "mandatory": true
    }
}

Field	Required	Value	Description	Limitation
title	Yes	String	Title text	1024 Bytes
options	Yes	List	List of quick reply options	20
options.label	Yes	String	Display name	128 Bytes
options.type	Yes	String	Option type: `postback`, `phone_number`, `web_url`, `trigger_intent`
options.value	Yes	String	The identified value	n/a
mandatory	No	Boolean	If true, the live chat client will disable the input box when the quick reply button is not clicked. Default: false	n/a

Text

To send plain text messages, use the text type.

{
    "type": "text",
    "value": "Hi, I'm your virtual agent!"
}

Field	Required	Value	Description	Limitation
value	Yes	String	Plain text	n/a

Video

To send a video (YouTube), use the video type.

{
    "type": "video",
    "value": {
        "title": "This is a title",
        "name": "video name",
        "url": "https://youtube.com/123456"
    }
}

Field	Required	Value	Description	Limitation
url	Yes	String	Video URL	n/a
title	No	String	Video title	128 Bytes
name	No	String	Video name	128 Bytes

Send messages to the virtual agent#

Request payload#

Request parameters#

Message input types#

Text#

Receive messages from the virtual agent#

Response payload#

Response parameters#

Message body structure#

Message content types#

Action#

Set variables#

Typing indicator#

Transfer to live agent#

Article#

Article source#

Attachment#

Audio#

Card#

Card option types#

Carousel#

Form#

Text input field#

Select field#

Multi-select field#

HTML#

Image#

Link#

Markdown#

Quick replies#

Text#

Video#

Send messages to the virtual agent

Request payload

Request parameters

Message input types

Text

Receive messages from the virtual agent

Response payload

Response parameters

Message body structure

Message content types

Action

Set variables

Typing indicator

Transfer to live agent

Article

Article source

Attachment

Audio

Card

Card option types

Carousel

Form

Text input field

Select field

Multi-select field

HTML

Image

Link

Markdown

Quick replies

Text

Video