Please note that if you have added your card to the App Store or Play Store, your iOS/Android app payment will be charged to that Store. Here's a guide on how to add your card to the Apple App Store and Google Play Store.
Here's a step-by-step guide on paying for Twitter Blue or X Premium.
Log in to your Twitter app and click on Premium.
Select if you are an individual or Organization.
Select the plan you would like to make payment for and tap the "Subscribe & Pay" option.
4. Confirm with the side button to complete the process.
5. Once completed, you can now enjoy Twitter Blue or X premium. 🥳