Sharepoint REST API - share document

I don't know.

Hi @Alvin ,
Below is the REST call using JavaScript code that shares a document from a SharePoint hosted app:

function shareDocument()  
{  
    var hostweburl = decodeURIComponent(getQueryStringParameter('SPHostUrl'));  
    var appweburl = decodeURIComponent(getQueryStringParameter('SPAppWebUrl'));  
    var restSource = appweburl + "/_api/SP.Sharing.DocumentSharingManager.UpdateDocumentSharingInfo";  
   
$.ajax(  
{  
    'url': restSource,  
    'method': 'POST',  
    'data': JSON.stringify({  
        'resourceAddress': 'documenturl',  
        'userRoleAssignments': [{  
            '__metadata': {  
                'type': 'SP.Sharing.UserRoleAssignment'  
            },  
            'Role': 1,  
            'UserId': 'Chris Tester'  
        }],  
        'validateExistingPermissions': false,  
        'additiveMode': true,  
        'sendServerManagedNotification': false,  
        'customMessage': "Please look at the following document",  
        'includeAnonymousLinksInNotification': false  
    }),  
    'headers': {  
        'accept': 'application/json;odata=verbose',  
        'content-type': 'application/json;odata=verbose',  
        'X-RequestDigest': $('#__REQUESTDIGEST').val()  
    },  
    'success': function (data) {  
        var d = data;  
    },  
    'error': function (err) {  
          
    }  
}  
);  
}  

UserRoleAssignments: This an array of users and roles that you want to share the document with. The Role property represents which permission you are assigning. 1 = View, 2 = Edit, 3 = Owner, 0 = None.

If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.