Fix credential usage and error output

credentials/HttpBinApi.credentials.ts

@@ -1,9 +1,7 @@
 import {
 	IAuthenticateGeneric,
-	ICredentialDataDecryptedObject,
 	ICredentialTestRequest,
 	ICredentialType,
-	IHttpRequestOptions,
 	INodeProperties,
 } from 'n8n-workflow';
 
@@ -33,9 +31,8 @@ export class HttpBinApi implements ICredentialType {
 	authenticate = {
 		type: 'generic',
 		properties: {
-			header: {
-				name: 'api-key',
-				value: '={{$credentials.apiKey}}',
+			headers: {
+				Authorization: '={{"Bearer " + $credentials.token}}',
 			},
 		},
 	} as IAuthenticateGeneric;

nodes/ExampleNode/ExampleNode.node.ts

@@ -61,7 +61,7 @@ export class ExampleNode implements INodeType {
 						error.context.itemIndex = itemIndex;
 						throw error;
 					}
-					throw new NodeOperationError(this.getNode(), error.message, {
+					throw new NodeOperationError(this.getNode(), error, {
 						itemIndex,
 					});
 				}