SSE costs estimates?
WorkersWe are trying to implement a payment flow between a client and a payment terminal. Since the state of the payment terminal changes somewhat frequently (from idle to online, online to standby for payment, etc), we are considering utilizing SSE between a backend (connected to the terminal) and our client to communicate state changes. While are believe HTTP polling might be cheaper for this, SSE makes implementation a lot cleaner. We couldn't find any documentaiton on SSE costs. We would greatly appeaciate is someone could share with us their costs findings with us using SSE 
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