How to merge data with form_fields_per_document
Updated Nov 25, 2025
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When using form_fields_per_document to place signer fields, you can use the custom_fields parameter to merge data into the text fields.
For the form fields, specify "type": "text-merge" as noted in these Field Types and include the "name" as well.
Using the name of the field, pass the data for the field using the custom_fields parameter.
Example cURL parameters:
-F 'form_fields_per_document=[[{"name": "Name of text field", "type": "text-merge", "x": 160, "y": 80, "width": 206, "height": 32, "signer": 0}]]' \
-F 'custom_fields=[{"name": "Name of the text field", "value": "This data will show up in the text box"}]'Community answers
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