4Seller Supports Connect GLS-US to 4Seller which help sellers fulfill orders conveniently! 

Step 1: Setting--Order & Shipping--Shipping Carreirs--Major Parcel Carriers--GLS-US

Note: GLS-US is authorized to 4Seller through EASYPOST.

Step 2: Setting custom name--Fill required Info--Connect 

Note: The required information must be obtained from the GLS logistics provider, and when obtaining it, you must inform GLS US about using EasyPost's API to purchase labels.

Step 3: After Authorizing pls check in the "Authorized Logistics Provider"

Any problems pls contact 4Seller Support Team: support@4seller.com