Webhooks

Here are the webhooks that fire after a mailing action is taken on a document (e.g. W-9, Form 1099-K, etc.) and the subsequent USPS status updates.

Webhook Events

Webhook Event	Cause
`MAILING_CREATED`	When a mailing is successfully created for USPS.
`MAILING_PROCESSING_FOR_DELIVERY`	When USPS has process the mailing, preparing it for delivery and its status is set to `PROCESSING_FOR_DELIVERY`.
`MAILING_IN_TRANSIT`	When USPS is actively delivering the mailing and its status is set to `IN_TRANSIT`.
`MAILING_DELIVERED`	When USPS has successfully delivered the mailing and its status is set to `DELIVERED`.
`MAILING_DELETED`	When a mailing request is deleted.
`MAILING_RETURNED_TO_SENDER`	When the USPS could not delivering the mailing, has initiated the mailing to be returned to its origin and its status is set to `RETURNED_TO_SENDER`.
`MAILING_UPDATED`	When any property (typically the `status`) of a mailing request has changed.

Read more on how to register and validate webhooks here.