Can't install and paypal sandbox not working with ReactCheckout

[namnguyenthanhwork]

I follow docs and install but it doesn't work for me.

`
npm i

preinstall
node scripts/configureCheckoutIntegrations && node scripts/configureThemes

Installing paypalExpress: git@github.com:hyva-themes/magento2-react-checkout-paypal-express.git
Error: Command failed: git clone git@github.com:hyva-themes/magento2-react-checkout-paypal-express.git ./src/paymentMethods/paypalExpress
Cloning into './src/paymentMethods/paypalExpress'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

at ChildProcess.exithandler (node:child_process:412:12)
at ChildProcess.emit (node:events:513:28)
at maybeClose (node:internal/child_process:1091:16)
at Socket.<anonymous> (node:internal/child_process:449:11)
at Socket.emit (node:events:513:28)
at Pipe.<anonymous> (node:net:313:12) {

code: 128,
killed: false,
signal: null,
cmd: 'git clone git@github.com:hyva-themes/magento2-react-checkout-paypal-express.git ./src/paymentMethods/paypalExpress',
stdout: '',
stderr: "Cloning into './src/paymentMethods/paypalExpress'...\n" +
'git@github.com: Permission denied (publickey).\r\n' +
'fatal: Could not read from remote repository.\n' +
'\n' +
'Please make sure you have the correct access rights\n' +
'and the repository exists.\n'
}
Themes successfully added

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found 0 vulnerabilities
`

After that, I clone repo checkout-paypal-express, move to paymentMethods and npm i -> It's working but when i can't place order

I have configured paypal sandbox, testing, place order using magento 2 successfully

But, when I using magento2-reactcheckout 2.0-develop, doesn't work.

Can everyone help me ? Thanks.