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Web Dapps Development
Good to know: It is mostly the same for you to develop a web based Dapp with ioPay as with Metamask, because ioPay has done as much compatible with Metamask as possible.
You can refer the official IoTeX development docs here:
Please find Dapp development guides for different chains as needed. ioPay supports most Web3 interfaces so your Dapps should be able to run with ioPay directly if it works with metamask.