Do I need to provide a Harmonised System (HS) code and where can I find the correct code?  Does Maersk Go offer a Switch Bill of Lading?  What happens if a LOA is not provided for the first Maersk Spot shipment before the first shipment is gated in? Can someone send Shipping Instructions for me from a different my.maerskline.com account? What is a Letter Of Authority? Will I be able to submit additional instructions?  How do I amend the Bill of Lading? If I want to change the details of my shipping instructions or if I notice an error, how do I amend it? How do I amend my Shipping instruction? What is an Importer Security Filing (ISF)?  Is bill of lading and shipping bill are same? What is the marks and numbers field in the shipping instructions?