Fix credentials naming to match class name

credentials/HttpBinApi.credentials.ts

@@ -0,0 +1,39 @@
+import {
+	IAuthenticateHeaderAuth,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from "n8n-workflow";
+
+export class HttpBinApi implements ICredentialType {
+	name = "httpbinApi";
+	displayName = "HttpBin API";
+	documentationUrl = "httpbin";
+	properties: INodeProperties[] = [
+		{
+			displayName: "API Key",
+			name: "apiKey",
+			type: "string",
+			default: "",
+		},
+		{
+			displayName: "Domain",
+			name: "domain",
+			type: "string",
+			default: "https://httpbin.org",
+		},
+	];
+	authenticate = {
+		type: "headerAuth",
+		properties: {
+			name: "api-key",
+			value: "={{$credentials.apiKey}}",
+		},
+	} as IAuthenticateHeaderAuth;
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: "={{$credentials?.domain}}/v3",
+			url: "/account",
+		},
+	};
+}