In perspective, on button event click, it will call SAP URL endpoint to fetch JSON data. So to get SAP integration(Data) which is the best way - using WebDev or SepaSoft modules(webservice and Business connector)
If you want Ignition to originate the call to an external API, you don’t need either module: just script it with system.net.httpClient().
Use WebDev if you want Ignition to offer and API for other systems to call.
Sepasoft’s Web Services module enables much of this with little or no scripting.
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Addition to above question , I have created an Endpoint in webdev that my SAP system needs to trigger .For security I am required to provide the Endpoint URL, Token URL, ClientID, Client Secret. I understand this is done using OAuth2 clients, but since I am new to this topic, how can I obtain these Details?
Ignition doesn't do OAuth processing for you in WebDev. You will have to implement it entirely yourself.