You can use our various REST APIs to access Wix user's site data (e.g., contacts, orders, etc.). Our APIs use standard HTTPS terminology and OAuth authentication, and return JSON-encoded responses. To use our APIs, site owners must grant you explicit permission to collect this data when installing your app on their site.
Use of Wix APIs are subject to the Wix App Market Guidelines.
There's more information available in our FAQ.
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