feat: Add WhatsApp Business Trigger Node (#8840)

Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Michael Kret <michael.k@radency.com>

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

@@ -0,0 +1,41 @@
+import type { ICredentialTestRequest, ICredentialType, INodeProperties } from 'n8n-workflow';
+
+export class WhatsAppTriggerApi implements ICredentialType {
+	name = 'whatsAppTriggerApi';
+
+	displayName = 'WhatsApp API';
+
+	documentationUrl = 'whatsApp';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'Client ID',
+			name: 'clientId',
+			type: 'string',
+			default: '',
+			required: true,
+		},
+		{
+			displayName: 'Client Secret',
+			name: 'clientSecret',
+			type: 'string',
+			typeOptions: {
+				password: true,
+			},
+			default: '',
+			required: true,
+		},
+	];
+
+	test: ICredentialTestRequest = {
+		request: {
+			method: 'POST',
+			baseURL: 'https://graph.facebook.com/v19.0/oauth/access_token',
+			body: {
+				client_id: '={{$credentials.clientId}}',
+				client_secret: '={{$credentials.clientSecret}}',
+				grant_type: 'client_credentials',
+			},
+		},
+	};
+}