I am trying to fulfill an order using shopify API and Asp.Net,C#. How can I do it
Do I need to create a new fullfillment first and than Modify an existing Fulfillment.
End result is I want to update the tracking information back to Shopify Order and inform the customer that fullfillment is done and here is your tracking information.
Also do I need to generate a fullfillment id or Shopify does that and gives a unique number?