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Upon mutual agreement, the completion can be delayed beyond the due date specified in the contract terms. The parties may reach an agreement via the Contract Chat, or otherwise.
If you are unable to fulfill the contract conditions before the due date, notify the Contractee as soon as possible. Once the due date has passed, the other party will be able to open a dispute.
Also, the Contractor must specify the order fulfillment details when confirming completion. This helps avoid misunderstandings between the parties upon receival of the product/service. Also, it provides additional evidence in case of dispute.
Good to know
As with all contract actions, it is processed by nodes (individual computers) of the blockchain network and has a gas fee.