Adhika Masam Ekadasi - Kamla Ekadasi - pooja procedure.

 offer unbroken coco nut, tulasi leaves fruits to god at 6 hours intergval gives the benefits of 1000 yagnas.

https://www.hindu-blog.com/2010/04/kamla-ekadasi-adhik-masa-kamala-ekadahi.html

Mantra to chant : om namo bhagavate vasudevaya