Payovrata is the vrata

Vrata

In the context of Hinduism and Hindu mythology, the term vrata denotes a religious practice to carry out certain obligations with a view to achieve divine blessing for fulfillment of one or several desires. Etymologically, vrata, a Sanskrit word , means to vow or to promise...

 or penance observed by Goddess

Goddess

A goddess is a female deity. In some cultures goddesses are associated with Earth, motherhood, love, and the household. In other cultures, goddesses also rule over war, death, and destruction as well as healing....

 Aditi

Aditi

Aditi in Sanskrit, an ancient Indian language. In the Vedas Aditi is mother of the gods from whose cosmic matrix the heavenly bodies were born...

 to propitiate Lord Vishnu

Vishnu

Vishnu is the Supreme god in the Vaishnavite tradition of Hinduism. Smarta followers of Adi Shankara, among others, venerate Vishnu as one of the five primary forms of God....

.

Ritual Activity

It is usually observed for 12 days, and during that time the devotee subsists on a diet of milk alone. http://vedabase.net/sb/8/16/en1

In Hindu Mythology

A notable event is that of Sage

Wise old man

The wise old man is an archetype as described by Carl Jung, as well as a classic literary figure, and may be seen as a stock character...

 Kashyap

Kashyap

Kashyapa was an ancient sage , who is one of the Saptarshis in the present Manvantara; with others being Atri, Vashishtha, Vishvamitra, Gautama, Jamadagni, Bharadwaja...

 who asked his wife, Aditi

Aditi

Aditi in Sanskrit, an ancient Indian language. In the Vedas Aditi is mother of the gods from whose cosmic matrix the heavenly bodies were born...

, to use this method to please Lord Narayana so that a solution could be found for her son who was defeated by the Asura

Asura

-In Hinduism:In Hinduism, the Asuras constitute a group of power-seeking deities, sometimes considered sinful and materialistic. The Daityas and Danavas were combinedly known as Asuras. The Asura were opposed to the Devas. Both groups are children of Kasyapa...

s. This penance

Penance

Penance is repentance of sins as well as the proper name of the Roman Catholic, Orthodox Christian, and Anglican Sacrament of Penance and Reconciliation/Confession. It also plays a part in non-sacramental confession among Lutherans and other Protestants...

 finally resulted in the Vamana

Vamana

Vamana is described in the Puranic texts of Hinduism as the Fifth Avatar of Vishnu, and the first incarnation of the Second Age, or the Treta yuga. Also he is the first Avatar of Vishnu which appears with a completely human form, though it was that of a dwarf brahmin. He is also sometimes known as...

 Avatar

Avatar

In Hinduism, an avatar is a deliberate descent of a deity to earth, or a descent of the Supreme Being and is mostly translated into English as "incarnation," but more accurately as "appearance" or "manifestation"....

 sending Mahabali

Mahabali

Mahabali , also known as Bali or Māveli was a benevolent Asura King, and the grandson of Prahlada. The festival of Onam commemorates his yearly homecoming after being sent down to the underworld by Vamana, the fifth avatar of Vishnu.-Conquest of the Universe and banishment:Bali, an asura, was the...

to the netherworld. http://vedabase.net/sb/8/16/en1