You must add a webhook to your Stripe account, if you doesn't have one, just follow guide on <a href="{stripeLink}" target="_blank" rel="noopener noreferrer">this link</a> to add a new one.
Add URL <a href="{stripeCallbackUrl}" target="_blank" rel="noopener noreferrer">{stripeCallbackUrl}</a> to Endpoint URL field then save it. Remember to enable following Stripe events: Payment Intent, Customer, Invoice.
You need to retrieve your webhook's secret from Stripe Dashboard’s - Webhooks settings, select webhook and obtain the secret.