ActiveCampaign

When adding links in a campaign, use the personalization tags:

• %FIRSTNAME%

• %PERSONALIZATIONTAG% - this is found in your Settings / Manage Fields page for defining custom conact fields

https://mysite.com/?first_name=%FIRSTNAME%&st1=%COMPANY_NAME%

Here are some helpful guides from ActiveCampaign:

Personalization TagsActiveCampaign Help Center