The custom_line parameter is a snippet that substitutes the text entered into an influencer's profile under the custom line section. You may enter a custom line towards the bottom of the left half of their profile:

This feature is designed to help you personalize emails when reaching out to influencers. It's completely optional to use.
Here’s a quick demo of how you would use this in practice: SARAL - Your Influencer Assistant
Still have questions?
Reach out anytime via the support chat at the bottom-right corner of your dashboard, or email us at support@getsaral.com. We’re happy to assist!