On December 1, 2018, the World Customs Organization (WCO) signed a Memorandum of Understanding (MoU) with the International Monetary Fund (IMF).
The MoU creates a framework of cooperation between the two organizations to support analysis and research for Customs administrations.
The WCO press release may be found here:
http://www.wcoomd.org/en/media/newsroom/2018/december/wco-signs-memorandum-of-understanding-with-imf.aspx