This method selects vouchers that are suitable for publication, adds a publish entry and returns the publication.
A voucher is suitable for publication when it's active and hasn't been published yet.
Clearly define the source of the voucher
You must clearly define which source you want to publish the voucher code from. It can either be a code from a campaign or a specific voucher identified by a code.
Publish multiple vouchers
In case you want to publish multiple vouchers within a single publication, you need to specify the campaign name and number of vouchers you want to publish.
In case you want to ensure the number of publishable codes increases automatically with the number of customers, you should use an auto-update campaign.