WhatsApp has launched its payment feature last year in India after some regulatory hurdles. The feature is not currently enabled all of its users, but a miniscule percentage of its users. WhatsApp payments is based on UPI (Unified Payments Interface), it features a simple interface for sending money. WhatsApp has recently added payment chat shortcut, to quickly send payments from the chat bar. According to report from WABetainfo WhatsApp is testing a new feature to let users in India receive cashbacks for sending payments using its payments feature.
The feature is under testing as of now and therefore it is not yet available, this appeared on Android Beta versions, since the feature is still in development, it is not yet available for beta users also. It is not clear if all the users will receive some cashback or only those who never used the feature will get the cashback to encourage them from using the service. Gpay and other payment apps used to give cashbacks to grow their user base, this practice is still followed by Gpay but they are mostly sending coupons rather than cashbacks these days.
Cashback is limited to one time per user and you may receive cashback of up to Rs 10 according to reports, but this may change after the feature goes live for users in India.