When you are trying to apply for a work permit in China, likely you will  need to provide your diploma and No criminal background check(or FBI Identity History Summary Check). Both documents need to be certified by the Chinese Embassy before the local authorities can accept it.  Here is how you can get your diploma certified by the Embassy:

Step 1. contact your school registrar and request for a true copy(or notarized copy) of your diploma.  The registrar should then execute an affidavit attesting to the validity of the diploma(true copy) before a notary public. Frequently the business offices of colleges and universities have notaries public.

Step 2. Email Oasis a copy of your document, we will review your document and provide further instructions.

Certain states may process documents faster or slower than others, normally it takes 3-4 weeks to complete. State of CA and NY are extremely slow (take months to complete), we recommend to hand delivery the document over the counter for state level authentication.