feat(Postmark Trigger Node): Update credentials so they can be used with the HTTP Request Node (#4790)

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

@@ -1,4 +1,9 @@
-import { ICredentialType, INodeProperties } from 'n8n-workflow';
+import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
 
 export class PostmarkApi implements ICredentialType {
 	name = 'postmarkApi';
@@ -12,4 +17,19 @@ export class PostmarkApi implements ICredentialType {
 			default: '',
 		},
 	];
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'X-Postmark-Server-Token': '={{$credentials.serverToken}}',
+			},
+		},
+	};
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://api.postmarkapp.com',
+			url: '/server',
+			method: 'GET',
+		},
+	};
 }

packages/nodes-base/nodes/Postmark/GenericFunctions.ts

@@ -13,13 +13,10 @@ export async function postmarkApiRequest(
 	option: IDataObject = {},
 	// tslint:disable-next-line:no-any
 ): Promise<any> {
-	const credentials = await this.getCredentials('postmarkApi');
-
 	let options: OptionsWithUri = {
 		headers: {
 			'Content-Type': 'application/json',
 			Accept: 'application/json',
-			'X-Postmark-Server-Token': credentials.serverToken,
 		},
 		method,
 		body,
@@ -32,7 +29,7 @@ export async function postmarkApiRequest(
 	options = Object.assign({}, options, option);
 
 	try {
-		return await this.helpers.request!(options);
+		return await this.helpers.requestWithAuthentication.call(this, 'postmarkApi', options);
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error);
 	}