Contact custom properties
Hubspot custom properties allow you to map non-standard data from your source app to Hubspot. Follow the instructions in the linked article to learn how to setup custom fields in your Hubspot instance: https://knowledge.hubspot.com/properties/create-and-edit-properties
Custom property mapping in Middle
Within the action to update or create a contact in Hubspot, you can construct an array of key-value pair objects to map integrated data to your custom property.
Internal name

You will need to enter the internal name as the key in Middle. To view the internal name of a property click the </> code code icon to view or set the internal name for the property, with a maximum of 100 characters.
Once a property is created, the internal name cannot be edited

To create this array, follow the below steps:
Create a new action node in your workflow and then select the action to create or update a contact in Hubspot
Click to create a new parameter under any of the three customer property arrays
Click to construct an array
Add a new parameter within this array
Click to construct an object
This will give you an object where you can add a text box to the custom field key and then map your data in the value
This input parameter can accept all data types. If you receive a data type error in the workflow editor, you can feel free to ignore it.
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