# VoucherifySdk::CreatePublicationWithCampaign ## Properties | Name | Type | Description | Notes | | ---- | ---- | ----------- | ----- | | **source_id** | **String** | The merchant’s publication ID if it is different from the Voucherify publication ID. It's an optional tracking identifier of a publication. It is really useful in case of an integration between multiple systems. It can be a publication ID from a CRM system, database or 3rd-party service. If `source_id` is provided only 1 voucher can be published per request. | [optional] | | **customer** | [**Customer**](Customer.md) | | | | **metadata** | **Object** | The metadata object stores all custom attributes assigned to the publication. A set of key/value pairs that you can attach to a publication object. It can be useful for storing additional information about the publication in a structured format. | [optional] | | **campaign** | [**CreatePublicationCampaign**](CreatePublicationCampaign.md) | | |