English language sources on Cao Dai describe devotional ritual offerings, incense, fruit, flowers, tea and alcohol, at daily temple ceremonies, but none states a fixed due, a percentage of income or an enforcement consequence for not giving, the shape every other body on the atlas's member giving expectations axis carries.
What would resolve this A direct reading of the Tan Luat (Cao Dai's New Canonical Law) or the Phap Chanh Truyen (Religious Constitution), or a scholarly ethnography of Tay Ninh Holy See temple finance, stating whether registered Cao Dai members owe a fixed contribution and what follows if they do not pay it.
OpenVietnamese religious studies, primary source review of Cao Dai canonical textsWikipedia contributors, Cao Dai (Wikipedia)