Login to your Stripe account and head over to the API Keys section. Under Restricted keys press Create restricted key.
As Key name enter "Conflux"
At the permissions column click read at All core resources / Customers
At the permissions column click read at All Billing resources / Subscriptions
Click Create key at the bottom
You will be taken back to the API Keys page. Click Reveal live key token next to the "Conflux" API key to reveal its value. Paste this value in Conflux at the Stripe integration settings.