In this regard, the Consulate will no longer authenticate the signatures of public documents notarized by any US notary public or those signed/issued/certified by a Federal, State, County, City, university or school official, starting on 15 May 2019.
To use these types of documents in the Philippines, these will only require an Apostille Certificate issued by competent authorities listed below. Check with them the requirements and process on how to obtain Apostille since the process differs from one State to another.
Also, please note that documents with Apostille Certificate require no further diplomatic or consular legalization. Hence, said documents could already be sent to and used directly in the Philippines.