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Barnard CrespiBarnard Crespi 

Invoice, order, account balance look-up

I  have an external application that requires looking up an invoice # (or order # or account #)  in SF and obtaining a dollar $ amount . The objective is to present the customer with the amount of the specific item and if possible with their outstanding balance. We cannot use 3rd party apps as this needs to be a direct integration between our application and SF. 
Can anyone guide me where I should get started?  
Thank you in advance for your feedback. 
Missy LongshoreMissy Longshore
Hi Barnard, Wow, if you can't use 3rd party apps, you're in for a much greater challenge (aka, custom development)! Check out this Trailhead module: https://trailhead.salesforce.com/modules/apex_integration_services to begin to understand how custom apex code can allow you to integrate with your external application. Good luck! Missy