Zeebe carries custom data from task to task in form of variables. Variables are key-value-pairs and part of the workflow instance.

By default, all job variables are merged into the workflow instance. This behavior can be customized by defining an output mapping at the task. Input mappings can be used to transform the variables into a format that is accepted by the job worker.

name: order-process

tasks:
    - id: collect-money
      type: payment-service
      inputs:
          - source: totalPrice
            target: price
      outputs:
          - source: success
            target: paymentSuccess

    - id: fetch-items
      type: inventory-service

    - id: ship-parcel
      type: shipment-service

Every mapping element has a source and a target element which must be a variable expression.

• Data Flow
• Variable Mappings