At first it was really nice using the app but recently the app has not been working. It's very hard to put the tracking number in and it always give you a message that it is having some internal errors. Then it's hard to get a correction from customer service and support to get your money that's due to you for selling your products 2022 Update.... it's impossible to get people on the phone. My credit card is valid, they sent pennies to my bank and still it says my card is invalid