Metadata variables

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Introduction

Payload metadata variables (known as meta-variables) can be added by custom scripts and the set variables shape.

There may be times when you need to define variables or parameters for a process flow step using values from the incoming payload metadata. This can be achieved using a specific payload syntax in the process flow connection shape.

Need to know

• Payload metadata cannot exceed 10240 bytes. Exceeding this limit will cause the process flow to fail on the associated step.
• Meta-variable values are string values.

Referencing meta variables

Payload metadata can be accessed via a variable or parameter field using the syntax below:

[[meta.unique_key]]

For example:

[[meta.id]]

When defining variables you can 'mix and match' payload, **metadata** and flow variables. For example:

!

When a payload is passed to a 'child' process flow via the run process flow shape, meta variables are included.

Related information

• Payload variables
• Flow variables
• Generating dynamic cache keys with variables