When serving a business or individual in a foreign country — you must first see what treaty applies to that country — Hague Convention Treaty or Inter-American Convention. If the country is not part of any treaty then you will need to go through the U.S. State Department. This process is what we refer to as “formal method”.
An informal method will be to use a local process server in that country or to fed/ex or mail the legal documents abroad. We do not recommend “informal” service of process unless your Judge specifically has approved it in advance. Also, “informal” service should never be used in the event you will want to collect on the monetary judgment entered in your favor.
Additional questions on this subject should be referred to an attorney.