I can't make a payment/update my payment method

• I've got an email from TradingView that my subscription can't be auto renewed
• My payment method won’t work, what am I doing wrong and what can I do?
• I use an AmEx card, and my payment attempts fail. Why?
• I can't update my payment method
• I can't subscribe to paid real-time data subscriptions in my mobile app
• I cannot pay for the subscription / I am not receiving a successful payment notification in mobile apps
• I do not have a payment button for a subscription on the website / in mobile apps
• Problems with mobile subscriptions in India