If the customer does not approve your project, it does not become binding for you to provide the services which means you do not have to deliver the services.
Also, if the project has not been approved, you cannot issue and send an invoice to the customer and receive payments.
Projects which are older 30 days and have not been approved by the customer will be recycled and moved back into draft status. You will be notified about this via e-mail. in this case, you can modify the project and send the project to the customer for review and approval again.