/callback
https://[YourDomain]/fb/callback
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IBKR will send notifications via RESTful Web API when status of a request changes.
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The notifications provided via the callback service have the same format as polling for a status (ie. /get-status)
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Notifications are only sent for requests that are initiated using DAM.

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Callback service is available by request only. To configure the service, provide the following information to dam@ibkr.com:
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URL which callback notifications should be sent to
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Master account ID which the callback service should be configured for
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IBKR will register the URL and configure the callback service for your account. This can take 2-3 business days.
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Clients enabled for Callback Notification can still use Polling for Status without any restrictions.
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HTTP codes: 200 indicates the request was successfully processed; in this case we will not retry to deliver the same data again.
For errors, the corresponding HTTP error codes should be returned.
JSON Response
{
"timestamp":"2017.12.21-06:21:37",
"request_status":"REQUEST_ACCEPTED_FOR_PROCESSING",
"processing_stats":
{
"instruction_set_id":786,
"trans_provided":1,
"trans_read":1,
"trans_understood":1,
"trans_rejected":0
},
"details":"<base64-encoded, PGP encrypted and signed XML containing instruction result set>"
}