If you do not use the standard Customer or Product picker but you create your own api.product() or api.customer () picker, you must explicitly retrieve the product or customer list – it is not done automatically.
The following example shows how to populate Customer input from a header logic:
cProcessor.addOrUpdateInput("ROOT", ["name": "CustomerGroup", "label": "Customer(s)", "type": InputType.CUSTOMERGROUP, "value": [
"customerFieldLabel": "Unique Customer Id",
"customerFieldName" : "customerId",
"customerFieldValue": customerId
]])