Web this article discusses 11 indicators to keep the services offered with your 3pl as high as possible, which in turn will provide cost savings while servicing the customer at the. Web service level agreement (sla) is a documented agreement between a service provider and a customer that identifies both the services required and the expected level of service. Web do not just accept a 3pl agreement template without a review. In most cases, 3pl contracts for fulfillment services are three years or longer. Web 3pl service agreement template sample download.