A company represents their customers as Accounts that have an External ID field called Customer_Number__c. They have a custom Order (Order__c) object, with a Lookup to Account, to represent Orders that are placed in their external order management system (OMS). When an order is fulfilled in the OMS, a REST call to Salesforce should be made that creates an Order record in Salesforce and retates it to the proper Account. What is the optimal way to implement this?

What is a consideration when using bind variables with dynamic SOQL? Choose 2 answers

A large company uses Salesforce across several departments. Each department has its own Salesforce Administrator. It was agreed that each Administrator would have their own sandbox in which to test changes.
Recently, users notice that fields that were recently added for one department suddenly disappear without warning. Also, Workflows that once sent emails and created tasks no longer do so. Which two statements are true regarding these issues and resolution? Choose 2 answers

What is the correct order of execution for Visualforce Page "postback" requests (when user interaction requires a page update)?

A developer has a test class that creates test data before making a mock call-out, but now receives a 'You have uncommitted work pending. Please commit or rollback before calling out' error.
What step should be taken to resolve the error?