Starting today, all store owners can now partially fulfill a line item. You can learn more about partial fulfillment in the Shopify Manual. The API docs have also been updated.
Shopify Admin Product Manager
It does not. We currently look at capturing as a separate step from fulfillment. Some people capture before fulfillment. Some people capture after. Also, the majority of Shopify store owners auto-capture. We're not currently planning on making any changes to the capturing process.
Thanks, Jonathan. I like the changes that have been made and did not mean to suggest that the two get tied programmatically. I too see capture as a separate step. Let me ask the question again this way:
If we have an order authorized for $100 and we capture $60 (say because we ship $60 of the order), can we later capture the other $40 through the Shopify admin when we are due the balance? Totally not connected to the fulfillment aspect. I just never tried it since we're accustomed to just going to PayPal in those cases.