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 3: Your secret and publishable keys should be on this page. Before using, generated secret keys you will need to use the toggle switch that says “Viewing test data”. You have to set it to ”Viewing live data”.
STEP 4: Now click on Reveal live key token
Paste the Secret and Publishable Keys in settings section of your "Business Tool" as shown below: