Finding your REDCap API URL - vubiostat/redcapAPI GitHub Wiki
The steps provided here to find your API's URL assume that you already have a token for your project. Please refer to Finding Your API Token for instructions to get your token.
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Navigate to your REDCap login screen and log in.

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Click on the tab for "My Projects" and select a project for which you have an API token.

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Click on the API link on the left navigational panel.

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Click on the link to the REDCap API Documentation.

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Select an option under "Supported Actions," such as Export Records.

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Your API address will appear in the place of the gray box in the image below.

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Enter the API address into either
redcapConnection(url=[your_url], token=[your_token])or set
options(redcap_api_url = [your_url])