How to use MoVend’s in-app billing on BlackBerry. I am playing a mobile game right now, and I would like to buy an in-app item of the game, Clicking on the buy button, I would be automatically brought to the MoVend payment page, with the relevant payment options based on where I am. I wish to buy this consumable and I would like to charge it to my PayPal account. After logging in with my credentials, and confirming the purchase, the purchase is initiated. There you have it, I have just bought my in-app item with MoVend!