We don't buy Platinum directly on IOS, Read below for how to get your Platinum on IOS
1️⃣Be sure Crossplatform is enabled and you must have a Computer - PC for this process.
Link: warframe.com/cross-save
2️⃣After you did Cross-platform is Enabled - ON (PC and IOS), We will give you the steps
3️⃣Once you receive the platinum on PC, you can use the Platinum on your IOS acc.
If you don't have PC
Enable Crossplatform, and send us your Warframe PC Login, I will do it for you!