Hi @Igor9805,
Square’s Subscriptions API currently creates an invoice that either charges the card on file or will send an invoice via email. Unfortunately a payment link and a configurable redirect isn’t currently available with the Subscriptions API.
Also in order to monitor if a subscription payment succeeded or failed you would subscribe to Invoices webhook events. With the invoice.payment_made event you get the order_id that you can use to call the Orders API to get the order associated to the webhook.