API to pull out completed tasks

Many times, customers would like to use their own landing page for various reasons. Sometimes, it’s to incorporate the feature within their intranet portal or to use Nintex within Teams or Slack. Today, all other actions can be completed using the API except for viewing a completed task. When the form has multiple fields and a custom design, they would like to see the completed tasks in the same design rather than just reading the details in a table. Also as we move towards NLX, I reckon this API will be important for pulling out the details into our custom pages in NLX as well.