Get PDF attachment from Smartsheet to send via Mailjet

Hello. My goal is to watch Smartsheet for a new row with an attachment (PDF file) and then get that attachment and send it via email using Mailjet.

I saw several months ago where using a Smartsheet API call, it seems possible to query for the Content-Type → PDF

I never got it working previously and now need to finish this. Has anyone successfully retrieved an attachment from Smartsheet? If so can you please explain the steps?