Top up your JR balance with Binance Pay, buy a UC code, and redeem it with your Character ID.
Many players in the Gulf and North Africa use Binance instead of a bank card. On JR you can turn your Binance balance into PUBG Mobile UC in three parts: top up, buy, redeem.
Open the PUBG Mobile page, choose the UC amount, and pay from your balance. Your order appears in Profile → Purchases, and the code shows there as soon as it is delivered.
You never need your PUBG password to redeem UC. Anyone who asks for it is trying to steal your account.
The UC usually arrives within a few minutes. If you do not see it, restart the game, then check that the Character ID was correct.