I am on the last module of the Build a Discount Calculator trail. I have verified the first 4 steps and received the 50 points (everything was configured correctly). Now, when I try to verify my last step I am getting the following error:

Challenge Not yet complete... here's what's wrong: 
The 'Calculate Discount' custom button doesn't exist or isn't properly configured. Check the instructions.

I've verfied the creation of the button, it's on the correct page layout and I've tested the button- it gives me the correct discount percentage and discounted amount.

Any other ideas on what I should check? I'm at a loss.

I've completed the challenge, it has 100% coverage. I've checked all the method names. The URL is valid. I've used Work Bench and curl to test and even tested with multiple Accounts with and without contacts.

I know on other challenges, punctionation was important.  What about the defination of the return? Are there expected names?

I built a class to hold Account ID & Name along with a List of Contact names and IDs. Is this my issue?  Anyone else have a challenge with this challenge?


Any help or hints will be appreciated.

Here are snippets of my code:

@RestResource(urlMapping='/Accounts/*/contacts')
global with sharing class AccountManager {

....

global class APIAccount {
        public ID Id;
        public String Name;
        List<APIContact> Contacts;

...

@HttpGet
    global static APIAccount getAccount() {
        RestRequest request = RestContext.request;
...