{{field_name}} in messages, conditions, External Requests, and integrations.
Not every system field appears in the Flow Builder suggestions list. You can still type
{{field_name}} manually — if the field exists, it resolves at runtime.Contacts
Account
Ads and Lead Ads
Facebook / Instagram comments and stories
Channel-specific
Pipelines, booking, questionnaire
E-commerce
Flow runtime and Inbox
Field not in the picker?
If an integration UI (for example Google Sheets) does not list a system field:- Create a custom field.
- Use Set Custom Field and set its value to
{{system_field}}. - Map the custom field in the integration.
Next
Collect data
Custom fields, tags, and user input.
Extract JSON
Pull values from JSON into custom fields.