I guess I am scammed by this job offer.
They talked with me with Whatsapp, gave me the cards detail to register, and asked me to buy in app.
Unfortunately, I paid three times (not a big price though).
I am worried about it.
Now, I am asking Apple to refund.
I do not know what I can do actually.
Sorry to hear this happned to you. There are many scam posts here on Upwork so you need to be very careful. Read and follow the ToS to protect yourself and others. You should never communicate with someone off of Upwork until after a contract has been set up.
I'm sorry to hear about your experience. You can report any job that seems suspicious by using the flagging option. You can read more on this help article and also, please check out Tips to avoid questionable jobs. You might also want to check out the information here to learn more about staying safe on Upwork.
Please know that it is also a violation of Upwork TOS to communicate outside the platform before a contract is placed.