Get workflow variables

Retrieve all variables available in a workflow, including both fixed system variables and variables discovered from execution history.

Returns two categories of variables:

• Fixed variables: Built-in system and context variables always available (flow_id, started_at, channel, phone_number, etc.)
• Discovered variables: User-defined variables observed during workflow executions, with sample values and usage statistics

Use this endpoint to:

• Understand what variables are available for use in workflow steps
• Review variable types and sample values for debugging
• Build autocomplete for variable references in workflow editors