US Green cards areeither approved domestically through the I-485, Adjustment of Status process,or approved abroad through the Consular process. When the approval is made atthe Consulate, the immigrant must make a final payment of $165 to the USCISbefore they will start the production of the green card.
The $165 USCISImmigrant Visa fee is for the cost of producing the green card.  This payment must be made through the USCIS ELIS (Electronic Immigrant System)on-line payment system.
MU Law encouragesyou to make this payment after you receive the immigrant visa packet from theUS Consulate or Embassy, before you come to the US.  Until this payment is made the USCIS will notstart production on your green card.
Atthe time of your interview at the U.S. embassy or consulate, the DOSinterviewing officer should give you a USCIS Immigrant Fee handout. Thisdocument provides instructions on how to pay the $165 immigrant fee andincluded your A-Number and DOS Case ID. Your A-Number and DOS Case ID arelocated in the top right corner.