Sorry to be vague but I want to build a restful webservice for my sharepoint365-online site as I want to be able to do some custom encryption from values sent by an adaptive card. I can't seem to find any specific 365 documentation, can find articles that use existing webservices (lists etc). Is it just the same as creating a webservice for an on-prem sharepoint ? If not can anybody point me to any kind of documentation specific to creating sharepoint-online webservices. I am pretty new to Sharepoint 365 online so not quite sure about the process for this. Any help is appreciated.

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There are multiple ways to access data from SharePoint Online:

SharePoint .NET Server, CSOM, JSOM, and REST API index

You can also use the Microsoft Graph API to access SharePoint Online:

Working with SharePoint sites in Microsoft Graph

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