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

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

Step 2: Setting custom name--Fill uidcliente--connect 

Note: uidcliente need to contact GLS Carriers to get it! 

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

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