Update Line Item Fulfillment Status

post https://api.helloextend.com/line-items/fulfill

Updates the fulfillment status of a Line Item. A Contract is created when a Line Item's status is updated to 'fulfilled', using the product and plan information associated with the Line Item.

Important:

A Line Item Fulfillment Status can only be updated from 'unfulfilled' to 'fulfilled'. Once updated to 'fulfilled', a Contract is created immediately and can only be undone by canceling the Contract.