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| Parameter | Required | Description |
| cid | Yes | Your account ID. |
| qid | Yes | ID of the queue the chat session is being directed to. |
| lang | No | Language to be used, this parameter is optional. It can be used to enforce the chat session to be in a specific language. Current supported values are: EN-US; FR-FR; ES-ES. Using any unsupported language will be interpreted as EN-US. The app will use the browser's preferred language if the lang variable is not specified. |
| fn | No | User's first name. |
| ln | No | User's last name. |
| ea | No | User's email adress. |
| pn | No | User's phone number. |
| iqry | No | User's inquiry (or reason why the chat session is being opened). |
| popid | No | Id of the screen-pop action to be used when the chat session is served to the agent. Screen-op actions must be defined within the administration portal. For security reasons, only the id of the action is allowed to be passed via query string. |
| itag | No | Interop tag (typically an identifier within your own web site that will be used later on to cross reference information). |
For more information on Reactive Chat, see Initiating Reactive Chat.
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