Warframe boosting across Credit Farming, Resource Farming, Mastery Rank Boost, Max Level (Rank 30) and Boss Carry. Every seller is identity-checked, and every payment is held in escrow until you confirm the order arrived.
Boosters log in to your account, so use a unique password and change it after the order. Choose Duo where offered — you play alongside the booster and keep control of your account.
Never directly. Your payment is held in escrow and released only after you confirm the rank was reached.
Open a dispute from the order page. An admin reads the chat and can refund you in full or in part.