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For efficiently hiding larger amounts multiple strings need to be encoded as one Base64-encoded string can contain 4, 2 or 0 bits of secret text. It is possible to hide information in this padding, as it is disregarded upon decoding. The Base64 encoding uses 0-padding when encoding data.

The 'offline_access' scope needed to request a refresh token is added by default.The technique of hiding information in public data is called steganography.

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* $scope - URL encoded, plus sign delimited list of scopes that your application requires. * $redirectURI - URL Encoded Redirect URI

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* The account owner is then redirected to your redirect URL with the authorization code and state appended as query parameters. * After visiting the URL, the account owner is prompted to log in and allow your app to access their account. * This function can be used to generate the URL an account owner would use to allow your app to access their account. To verify the nonce string value, decode the id_token. The id_token is encoded as a JWT and returned in the response when you request an access token.

The id_token includes information (claims) about the user and, if specified, the nonce value. For the purpose of mitigating replay attacks, specify the string value to use to associate a client session with an id_token. For more information on scopes and the specific scopes required by each V3 API endpoint, see the Scopes Overview page. The offline_access scope is required for returning refresh tokens. To create an authorization request, make a GET call to the authorization endpoint and include all required request query parameters.įor example, the following shows an encoded URL authorization request: Step 1: Create an Authorization RequestĬreate the authorization request used to direct users to Constant Contact to authenticate their user account and authorize your application to access their Constant Contact data. To use the Authorization Code Flow for authorization, complete the steps that follow. For more information, see Create an Application Integration. In order to use the Authorization Code Flow, you must first create and configure a V3 API application. When you get a new access token, you should always decode it to validate the access token claims and expiration.

The refresh token is used to extend the life of the access token without requiring users to re-authenticate their Constant Contact account and reauthorize your application to use their data. After users grant your application access to their data, Constant Contact sends you an access token that you use to make V3 API requests, and a refresh token. Using the Authorization Code Flow, you create an authorization request to allow users to authorize your application to use their Constant Contact data. Being a redirect-based flow, the client must be able to interact with the resource owner’s user-agent (typically a web browser) and receive incoming requests (via redirect) from the Constant Contact Authorization Server.īecause the Authorization Code Flow passes the access token directly to the web server that hosts the client application rather than to the user’s web browser, it is considered the most secure OAuth2 flow. Use the OAuth2 Authorization Code Flow for traditional web applications (your application runs on a web server and executes on a server) and is able to safely store the client secret.

Send API Requests on Behalf of Managed Client Accounts.

Cancel the Billing Plan for a Client Account.

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Update the Billing Plan for a Client Account.Get Billing Plan Details for a Client Account.Signup for a Technology Partner Developer Account.Get an Email Campaign Activities Stats Report.Delete an A/B Test for a Email Campaign Activity.

Create an A/B Test for a Email Campaign Activity.

Get A/B Test Details for a Email Campaign Activity.

Email Campaign Activities A/B Tests Overview.

Delete (Unschedule) a Resend to Non-openers Email Campaign Activity.

Get Details for a Resend to Non-openers Email Campaign Activity.

Post (Schedule) a Resend to Non-openers Email Campaign Activity.

Get Send History Details for Email Campaign Activities.

Get an HTML Preview of an Email Campaign Activity.

Get the Schedule of an Email Campaign Activity.

Get Email Campaign Details for a Single Email Campaign.

Autoresponder and Confirmed Opt-in Emails.

Create or Update a Contact Using a Single Method.

Remove Tags from Contacts Bulk Activity.

Remove Contacts from Lists Bulk Activity.

Update Your Applications to use the New Authorization Service.

Email Campaign V3 Changes and Migration.

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