You can pay the $300 upfront fee by USDT or BTC:
USDT (Network – TRX Tron(TRC20)):
TJUVjs5YuMYnWQMVFy2MS7GwYydousdYhi
BTC (Network – BTC Bitcoin):
18G9axdFzNLVfUn6f1qmhKUzu7t4zmxFgG
Please let us know after you pay the fee and send us the account credentials, and we will start passing the challenge for you.