To accept payments, you need to setup your Stripe account. Please visit this link to signup/register with Stripe. Once you setup your Stripe account, you'll have to generate Stripe API Keys.
To generate the Stripe API Keys (Secret Key and Publishable Key) please follow the steps give below:
STEP 1: Log in to your Stripe dashboard.
STEP 2: Go to API keys in the left menu.
STEP 4: Now click on Reveal live key token