Superbadge
Data Integration Specialist
Challenge Not yet complete... here's what's wrong:
Error : The 'ProjectRESTService' Apex REST service does not appear to be working properly. Calling the service either didn't update the opportunity correctly, return the string 'OK', create an associated project correctly or function correctly in general.

Synchronize external PMS system project data with Salesforce
Use the requirements above to implement an Apex REST service to process related project and opportunity data that comes in from the Square Peg external application. Before checking this section, run the service method in the ProjectRESTService class to confirm that it’s working as expected.  
Below is my code:
@RestResource(urlMapping = '/project/*')
global with sharing class ProjectRESTService {
    @HttpPost
    global static String postProjectData(String ProjectRef, String ProjectName, String OpportunityId,
                                       Date StartDate, Date EndDate, Double Amount, String Status){
        String retMsg = 'Error';
                
        SavePoint sp1 = Database.setSavePoint();
        try{
            List<Opportunity> lstOfOpps = new List<Opportunity>();
            
            if(OpportunityId != null && OpportunityId.trim().length() > 0){
                Opportunity opp = [SELECT Id, DeliveryInstallationStatus__c, Discount_Percent__c FROM Opportunity WHERE Id = :OpportunityId];
                opp.DeliveryInstallationStatus__c = 'In progress';
                                
                lstOfOpps.add(opp);
            }
            UPDATE lstOfOpps;
            
            List<Project__c> lstOfRrjts = new List<Project__c>();
            
            Project__c prjt = new Project__c();
            prjt.ProjectRef__c = ProjectRef;
            prjt.Name = ProjectName;
            prjt.Opportunity__c = OpportunityId;
            prjt.Start_Date__c = StartDate;
            prjt.End_Date__c = EndDate;
            prjt.Billable_Amount__c = Amount;
            prjt.Status__c = Status;
            
            lstOfRrjts.add(prjt);
            
            UPSERT lstOfRrjts;
            
            retMsg = 'OK';
        }catch(Exception ex){
            Database.rollback(sp1);
            retMsg = ex.getMessage();
        }
        return retMsg;
    }
}