Campaign ID in Mailgun Api transport

Hi all, I need to capture the value of the current campaign, after it has been triggered by the cron, and be able to read it in the MailgunApiTransport page.

I started from TriggeringCampaignCommand page, then CampaignModel, EmailModel, SendEmailToContact, sendStandardEmail,
MailHelper up to MailgunApiTransport.

I think I missed some steps though.
Do you have any suggestions or do you know where I could find information on the correct sequence involving the event?

thanks a lot for any kind of help.