The only thing that I can relate to this is that once when I was making a purchase on a website (Wish) an item was stated as cheaper if I bought with another person and from memory it said when someone else bought one and requested the same thing I would get matched up. But I was charged full price for it at checkout and paid through paypal. I have the split bill option on only a few of my purchases in Pay Pal and on this particular purchase it actually comes up with someone that I can put half the cost too, but apart from that on the other purchases with this option it comes up with no ones name except asking for their email address. I think if you purchase something in agreeance with someone to go halves in the cost then you pay for it in full and then go into the payment and enter their details in the split bill option to have them be charged half back to your account and they will have to approve for that payment to be transferred over.
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