Document the CSP directives required by the checkout flow - #105
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Adds a Content Security Policy section to the README.
Reported in #80: with a CSP header in place, the BitPay modal hangs on
"Please wait". The script loads fine, the iframe is blocked, and nothing
surfaces the error.
Directives were collected empirically, using
Content-Security-Policy-Report-Onlyon a local WHMCS install, in both Modaland Redirect, with a sandbox payment completed end to end.
script-src: needed in both modes, forbitpay.comandajax.googleapis.comframe-src: needed in Modal onlyconnect-src: not needed, the status polling happens inside the BitPay frame