License an Adobe Stock asset with Content/License and download it in a specific resolution via the Libraries/Download endpoint

Steps

1. Obtain an OAuth Bearer access token and call GET https://stock.adobe.io/Rest/Libraries/1/Content/License?content_id={id}&license=Standard with the standard x-Product/x-api-key/Authorization headers
2. Read purchase_details.state in the response ('just_purchased' or 'purchased' means the asset is now licensed) and purchase_details.url for the initial download link
3. To download at a specific size instead of the default, call GET https://stock.adobe.com/Rest/Libraries/Download/{id}/{license}?token={access_token}&size={size}, using the numeric {license} value returned in the license response, not a predicted value
4. Do not send an Authorization header on the Download call — pass the access token via the token query parameter instead, since an auth header can break the download URL
5. Follow the 302 redirect (or handle a direct file response) to retrieve the asset; valid size values include 400/800/1600/2400/3100/5000 for images and 1080/2160 for video
6. If your enterprise account requires license references, POST to Content/License with Content-Type application/json and a JSON body containing a cce_agency array instead of using GET