OBS_VALUE: <ul><li><a href=https://sso.agc.gov.sg/Act/PSA1999 target=_blank>Postal Services Act(Postal Services Act (Ch. 237A)(Original Enactment: Act 42 of 1999)Revised Edition 2000 (30th December 2000), last updated 01 April 2022, Section 6.)</a></li><li><a href=https://www.imda.gov.sg/regulations-and-licensing-listing/postal-services-operator-licence target=_blank>IMDA official website, Licensing of the Postal services operator(Postal Services Operator Licence - Guidelines, Note 3)</a></li><li><a href=https://sso.agc.gov.sg/SL/PSA1999-S231-2008 target=_blank>Postal services Regulation 2008(Postal Services Act(chapter 237a)Postal Services Regulations 2008. Entered into force on 2 May 2008. Article 15. )</a></li></ul>