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Ajay CherthedathAjay Cherthedath 

Integrating the web application with Salesforce and send frequent custom values into Salesforce

I am looking for more details on how I can integrate my web application with our clients Salesforce application and send some activity information into Salesforce. Do the client needs to setup all the relevant custom fields so that I can send values related to each records or can create custom fields on the fly using the REST API. Please advise.
If I read your question correctly, I believe that you have some external system that needs to push data into Salesforce?  If so it may be best to leverage a middleware solution but you could also create an Apex webservice to receive the calls.  The REST API is also always an option.  To get the best answer for your scenario you should read this document in dept