I am seeing other values and information using the API but not the Paypal Transaction ID, was it because the order was checked out using Ebay(another platform)? Is it because Shopify only acts like a medium for us to list our products from Shopify to Ebay. And since the information about the order placed and transaction all took place within the Platform of Ebay this information will only be available within their system? or is there a way for me to retrieve the Paypal Transaction ID within API? Any suggestions will be appreciated.
There isn't a way to access eBay transactional information via the Shopify API - you'll want to access that directly via the eBay platform. .