When used together with merge fields, custom_fields allows users to add pre-filled data to their signature requests. Pre-filled data can be used with "send-once" signature requests by adding merge fields with form_fields_per_document or Text Tags while passing values back with custom_fields together in one API call. For using pre-filled on repeatable signature requests, merge fields are added to templates in the Dropbox Sign UI or by calling /template/create_embedded_draft and then passing custom_fields on subsequent signature requests referencing that template.
| Name | Type | Description | Notes |
|---|---|---|---|
| Name | string | The name of a custom field. When working with pre-filled data, the custom field's name must have a matching merge field name or the field will remain empty on the document during signing. | Editor |