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In the website settings your-domain/admin/settings/payments add a new payment method Stripe
Fill in:
API Secret key (Use previously remembered secret key generated on Stripe API Keys page)
Webhook secret key (You can find it in your Stripe settings Developers → Webhooks → webhook, that configured on previous step → Signing secret → Click
Reveal
to show key)will be filled in automatically, this field is not editable
Click “Save”. System is configured.