You must configure the remote site setting to connect to the external merge service API.

To configure remote site settings

  1. Go to Setup > Security > Remote Site Settings.
  2. Click New Remote Site.
  3. Enter the following details:
    FieldDescription
    Remote Site NameEnter a remote site name.
    Remote Site URL

    Enter the remote site URL as https://<base-address>/api/integrate/v1/execute.

    For example:

    Disable Protocol SecurityLeave the checkbox unselected.
    DescriptionEnter a description.
    ActiveSelect the checkbox.
  4. Click Save.