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

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+import type {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class DeepLApi implements ICredentialType {
+	name = 'deepLApi';
+
+	displayName = 'DeepL API';
+
+	documentationUrl = 'deepl';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string',
+			typeOptions: { password: true },
+			default: '',
+		},
+		{
+			displayName: 'API Plan',
+			name: 'apiPlan',
+			type: 'options',
+			options: [
+				{
+					name: 'Pro Plan',
+					value: 'pro',
+				},
+				{
+					name: 'Free Plan',
+					value: 'free',
+				},
+			],
+			default: 'pro',
+		},
+	];
+
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			qs: {
+				auth_key: '={{$credentials.apiKey}}',
+			},
+		},
+	};
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL:
+				'={{$credentials.apiPlan === "pro" ? "https://api.deepl.com/v2" : "https://api-free.deepl.com/v2" }}',
+			url: '/usage',
+		},
+	};
+}