https://www.vice.com/en_us/article/n7nvzz/walmart-delivery-workers-say-new-pay-model-steals-their-tips

Point Pickup, a delivery contractor used by Walmart and other major retailers, has started dipping into customers’ tips to cover guaranteed pay for its gig workers, according to screenshots of the app and receipts obtained by Motherboard. 

Before recent changes to the app, gig workers on the Point Pickup platform were shown a payout amount alongside their delivery offers. Tips were processed later and paid out separately.