diff --git a/packages/nodes-base/credentials/AirtableApi.credentials.ts b/packages/nodes-base/credentials/AirtableApi.credentials.ts
index 2a3d8cdbfc..a9b023b2c8 100644
--- a/packages/nodes-base/credentials/AirtableApi.credentials.ts
+++ b/packages/nodes-base/credentials/AirtableApi.credentials.ts
@@ -1,4 +1,5 @@
 import {
+	IAuthenticateGeneric,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
@@ -16,4 +17,12 @@ export class AirtableApi implements ICredentialType {
 			default: '',
 		},
 	];
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				Authorization: '={{$credentials.apiKey}}',
+			},
+		},
+	};
 }
diff --git a/packages/nodes-base/credentials/NotionApi.credentials.ts b/packages/nodes-base/credentials/NotionApi.credentials.ts
index 322da31698..1c8e53a79f 100644
--- a/packages/nodes-base/credentials/NotionApi.credentials.ts
+++ b/packages/nodes-base/credentials/NotionApi.credentials.ts
@@ -1,4 +1,6 @@
 import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
@@ -15,4 +17,18 @@ export class NotionApi implements ICredentialType {
 			default: '',
 		},
 	];
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://api.notion.com/v1',
+			url: '/users',
+		},
+	};
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'Authorization': '=Bearer {{$credentials.apiKey}}',
+			},
+		},
+	};
 }
diff --git a/packages/nodes-base/credentials/SendGridApi.credentials.ts b/packages/nodes-base/credentials/SendGridApi.credentials.ts
index d2338f4419..95ee72d1c5 100644
--- a/packages/nodes-base/credentials/SendGridApi.credentials.ts
+++ b/packages/nodes-base/credentials/SendGridApi.credentials.ts
@@ -1,4 +1,5 @@
 import {
+	IAuthenticateGeneric,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
@@ -15,4 +16,12 @@ export class SendGridApi implements ICredentialType {
 			default: '',
 		},
 	];
+	authenticate = {
+		type: 'generic',
+		properties: {
+			headers: {
+				Authorization: '=Bearer {{$credentials.apiKey}}',
+			},
+		},
+	} as IAuthenticateGeneric;
 }
diff --git a/packages/nodes-base/credentials/TwilioApi.credentials.ts b/packages/nodes-base/credentials/TwilioApi.credentials.ts
index df5e1c1f12..802d4917ee 100644
--- a/packages/nodes-base/credentials/TwilioApi.credentials.ts
+++ b/packages/nodes-base/credentials/TwilioApi.credentials.ts
@@ -1,5 +1,9 @@
 import {
+	IAuthenticateGeneric,
+	ICredentialDataDecryptedObject,
+	ICredentialTestRequest,
 	ICredentialType,
+	IHttpRequestOptions,
 	INodeProperties,
 } from 'n8n-workflow';
 
@@ -74,4 +78,14 @@ export class TwilioApi implements ICredentialType {
 			},
 		},
 	];
+
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			auth: {
+				username: '={{ $credentials.authType === "apiKey" ? $credentials.apiKeySid : $credentials.accountSid }}',
+				password: '={{ $credentials.authType === "apiKey" ? $credentials.apiKeySecret : $credentials.authToken }}',
+			},
+		},
+	};
 }
diff --git a/packages/nodes-base/credentials/UrlScanIoApi.credentials.ts b/packages/nodes-base/credentials/UrlScanIoApi.credentials.ts
index df29c66cf8..299386d59b 100644
--- a/packages/nodes-base/credentials/UrlScanIoApi.credentials.ts
+++ b/packages/nodes-base/credentials/UrlScanIoApi.credentials.ts
@@ -1,4 +1,6 @@
 import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
@@ -16,4 +18,19 @@ export class UrlScanIoApi implements ICredentialType {
 			required: true,
 		},
 	];
+	authenticate = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'API-KEY': '={{$credentials.apiKey}}',
+			},
+		},
+	} as IAuthenticateGeneric;
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://urlscan.io',
+			url: '/user/quotas',
+		},
+	};
 }
diff --git a/packages/nodes-base/credentials/WordpressApi.credentials.ts b/packages/nodes-base/credentials/WordpressApi.credentials.ts
index ade71b8582..47dd3585d2 100644
--- a/packages/nodes-base/credentials/WordpressApi.credentials.ts
+++ b/packages/nodes-base/credentials/WordpressApi.credentials.ts
@@ -50,3 +50,4 @@ export class WordpressApi implements ICredentialType {
 		},
 	};
 }
+
diff --git a/packages/nodes-base/nodes/Airtable/GenericFunctions.ts b/packages/nodes-base/nodes/Airtable/GenericFunctions.ts
index 1f6b5b2ffb..05057a6e3f 100644
--- a/packages/nodes-base/nodes/Airtable/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/Airtable/GenericFunctions.ts
@@ -1,7 +1,6 @@
 import {
 	IExecuteFunctions,
-	IHookFunctions,
-	ILoadOptionsFunctions,
+	IPollFunctions,
 } from 'n8n-core';
 
 import {
@@ -11,10 +10,9 @@ import {
 import {
 	IBinaryKeyData,
 	IDataObject,
+	ILoadOptionsFunctions,
 	INodeExecutionData,
-	IPollFunctions,
 	NodeApiError,
-	NodeOperationError,
 } from 'n8n-workflow';
 
 
@@ -39,7 +37,7 @@ export interface IRecord {
  * @param {object} body
  * @returns {Promise<any>}
  */
-export async function apiRequest(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IPollFunctions, method: string, endpoint: string, body: object, query?: IDataObject, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
+export async function apiRequest(this: IExecuteFunctions | ILoadOptionsFunctions | IPollFunctions, method: string, endpoint: string, body: object, query?: IDataObject, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
 	const credentials = await this.getCredentials('airtableApi');
 
 	query = query || {};
@@ -47,7 +45,7 @@ export async function apiRequest(this: IHookFunctions | IExecuteFunctions | ILoa
 	// For some reason for some endpoints the bearer auth does not work
 	// and it returns 404 like for the /meta request. So we always send
 	// it as query string.
-	query.api_key = credentials.apiKey;
+	// query.api_key = credentials.apiKey;
 
 	const options: OptionsWithUri = {
 		headers: {
@@ -69,7 +67,7 @@ export async function apiRequest(this: IHookFunctions | IExecuteFunctions | ILoa
 	}
 
 	try {
-		return await this.helpers.request!(options);
+		return await this.helpers.requestWithAuthentication.call(this, 'airtableApi', options);
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error);
 	}
@@ -81,14 +79,14 @@ export async function apiRequest(this: IHookFunctions | IExecuteFunctions | ILoa
  * and return all results
  *
  * @export
- * @param {(IHookFunctions | IExecuteFunctions)} this
+ * @param {(IExecuteFunctions | IExecuteFunctions)} this
  * @param {string} method
  * @param {string} endpoint
  * @param {IDataObject} body
  * @param {IDataObject} [query]
  * @returns {Promise<any>}
  */
-export async function apiRequestAllItems(this: IHookFunctions | IExecuteFunctions | IPollFunctions, method: string, endpoint: string, body: IDataObject, query?: IDataObject): Promise<any> { // tslint:disable-line:no-any
+export async function apiRequestAllItems(this: IExecuteFunctions | ILoadOptionsFunctions | IPollFunctions, method: string, endpoint: string, body: IDataObject, query?: IDataObject): Promise<any> { // tslint:disable-line:no-any
 
 	if (query === undefined) {
 		query = {};
diff --git a/packages/nodes-base/nodes/Notion/GenericFunctions.ts b/packages/nodes-base/nodes/Notion/GenericFunctions.ts
index 7344545879..942e5856bd 100644
--- a/packages/nodes-base/nodes/Notion/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/Notion/GenericFunctions.ts
@@ -55,14 +55,12 @@ export async function notionApiRequest(this: IHookFunctions | IExecuteFunctions
 			json: true,
 		};
 		options = Object.assign({}, options, option);
-		const credentials = await this.getCredentials('notionApi');
-		if (!uri) {
-			//do not include the API Key when downloading files, else the request fails
-			options!.headers!['Authorization'] = `Bearer ${credentials.apiKey}`;
-		}
 		if (Object.keys(body).length === 0) {
 			delete options.body;
 		}
+		if (!uri) {
+			return this.helpers.requestWithAuthentication.call(this,'notionApi', options );
+		}
 		return this.helpers.request!(options);
 
 	} catch (error) {
diff --git a/packages/nodes-base/nodes/SendGrid/GenericFunctions.ts b/packages/nodes-base/nodes/SendGrid/GenericFunctions.ts
index 4787312b6b..aacf6da506 100644
--- a/packages/nodes-base/nodes/SendGrid/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/SendGrid/GenericFunctions.ts
@@ -14,14 +14,10 @@ import {
 } from 'n8n-workflow';
 
 export async function sendGridApiRequest(this: IHookFunctions | IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, endpoint: string, method: string, body: any = {}, qs: IDataObject = {}, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any
-	const credentials = await this.getCredentials('sendGridApi');
 
 	const host = 'api.sendgrid.com/v3';
 
 	const options: OptionsWithUri = {
-		headers: {
-			Authorization: `Bearer ${credentials.apiKey}`,
-		},
 		method,
 		qs,
 		body,
@@ -39,7 +35,7 @@ export async function sendGridApiRequest(this: IHookFunctions | IExecuteFunction
 
 	try {
 		//@ts-ignore
-		return await this.helpers.request!(options);
+		return await this.helpers.requestWithAuthentication.call(this, 'sendGridApi', options);
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error);
 	}
diff --git a/packages/nodes-base/nodes/Twilio/GenericFunctions.ts b/packages/nodes-base/nodes/Twilio/GenericFunctions.ts
index e1612dbe38..2d0a37a72c 100644
--- a/packages/nodes-base/nodes/Twilio/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/Twilio/GenericFunctions.ts
@@ -41,20 +41,8 @@ export async function twilioApiRequest(this: IHookFunctions | IExecuteFunctions,
 		json: true,
 	};
 
-	if (credentials.authType === 'apiKey') {
-		options.auth = {
-			user: credentials.apiKeySid,
-			password: credentials.apiKeySecret,
-		};
-	} else if (credentials.authType === 'authToken') {
-		options.auth = {
-			user: credentials.accountSid,
-			pass: credentials.authToken,
-		};
-	}
-
 	try {
-		return await this.helpers.request(options);
+		return await this.helpers.requestWithAuthentication.call(this, 'twilioApi', options);
 	} catch (error) {
 		throw new NodeApiError(this.getNode(), error);
 	}
diff --git a/packages/nodes-base/nodes/UrlScanIo/GenericFunctions.ts b/packages/nodes-base/nodes/UrlScanIo/GenericFunctions.ts
index 8a3d5deaf6..f58604ae8e 100644
--- a/packages/nodes-base/nodes/UrlScanIo/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/UrlScanIo/GenericFunctions.ts
@@ -18,12 +18,8 @@ export async function urlScanIoApiRequest(
 	body: IDataObject = {},
 	qs: IDataObject = {},
 ) {
-	const { apiKey } = await this.getCredentials('urlScanIoApi') as { apiKey: string };
 
 	const options: OptionsWithUri = {
-		headers: {
-			'API-KEY': apiKey,
-		},
 		method,
 		body,
 		qs,
diff --git a/packages/nodes-base/nodes/UrlScanIo/UrlScanIo.node.ts b/packages/nodes-base/nodes/UrlScanIo/UrlScanIo.node.ts
index 78076b1d1b..b7e9dd7b28 100644
--- a/packages/nodes-base/nodes/UrlScanIo/UrlScanIo.node.ts
+++ b/packages/nodes-base/nodes/UrlScanIo/UrlScanIo.node.ts
@@ -46,7 +46,6 @@ export class UrlScanIo implements INodeType {
 			{
 				name: 'urlScanIoApi',
 				required: true,
-				testedBy: 'urlScanIoApiTest',
 			},
 		],
 		properties: [
@@ -68,39 +67,6 @@ export class UrlScanIo implements INodeType {
 		],
 	};
 
-	methods = {
-		credentialTest: {
-			async urlScanIoApiTest(
-				this: ICredentialTestFunctions,
-				credentials: ICredentialsDecrypted,
-			): Promise<INodeCredentialTestResult> {
-				const { apiKey } = credentials.data as { apiKey: string };
-
-				const options: OptionsWithUri = {
-					headers: {
-						'API-KEY': apiKey,
-					},
-					method: 'GET',
-					uri: 'https://urlscan.io/user/quotas',
-					json: true,
-				};
-
-				try {
-					await this.helpers.request(options);
-					return {
-						status: 'OK',
-						message: 'Authentication successful',
-					};
-				} catch (error) {
-					return {
-						status: 'Error',
-						message: error.message,
-					};
-				}
-			},
-		},
-	};
-
 	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
 		const items = this.getInputData();
 		const returnData: IDataObject[] = [];