feat(MailerLite Node): Update node to support new api (#11933)

packages/nodes-base/credentials/MailerLiteApi.credentials.ts

@@ -1,4 +1,10 @@
-import type { ICredentialType, INodeProperties } from 'n8n-workflow';
+import type {
+	ICredentialDataDecryptedObject,
+	ICredentialTestRequest,
+	ICredentialType,
+	IHttpRequestOptions,
+	INodeProperties,
+} from 'n8n-workflow';
 
 export class MailerLiteApi implements ICredentialType {
 	name = 'mailerLiteApi';
@@ -15,5 +21,37 @@ export class MailerLiteApi implements ICredentialType {
 			typeOptions: { password: true },
 			default: '',
 		},
+		{
+			displayName: 'Classic API',
+			name: 'classicApi',
+			type: 'boolean',
+			default: true,
+			description:
+				'If the Classic API should be used, If this is your first time using this node this should be false.',
+		},
 	];
+
+	async authenticate(
+		credentials: ICredentialDataDecryptedObject,
+		requestOptions: IHttpRequestOptions,
+	): Promise<IHttpRequestOptions> {
+		if (credentials.classicApi === true) {
+			requestOptions.headers = {
+				'X-MailerLite-ApiKey': credentials.apiKey as string,
+			};
+		} else {
+			requestOptions.headers = {
+				Authorization: `Bearer ${credentials.apiKey as string}`,
+			};
+		}
+		return requestOptions;
+	}
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL:
+				'={{$credentials.classicApi ? "https://api.mailerlite.com/api/v2" : "https://connect.mailerlite.com/api"}}',
+			url: '/groups',
+		},
+	};
 }