What are my options if I want to build a web based service with XMR payment gateway?
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OK so I see there are APIs for XMR for checking blocks. How could I decode amount from the block with my view key having tx id? – h173k Jan 9 '20 at 0:33
You will want to use the wallet RPC interface, not daemon RPC.
Therefore, if you are going to be using payment IDs you can use get_payments, or if you plan to use subaddresses per customer/order you can use incoming_transfers to monitor incoming transactions by subaddress.