Tulo Paywall - Plug & Play¶

Target audience: Developers, Stakeholders

Introduction¶

This document describes how you can integrate with the Tulo Paywall using the Plug & Play method.

Tulo paywall plug & play

Step 1¶

Create a Tulo Paywall API user¶

To enable communication between your site and Payway you need to create a Tulo Paywall API user. The API user must include the following scopes:

/external/me/w
/external/paywall/r

Since the communication will be done client-side rather than server-side it will also trigger a CORS request. Hence the API user must allow incoming requests from your domain. To allow client-side requests to the API you need to whitelist your domains that perform the requests to the API user.

Example of whitelisting a domain for an API user

Contact Adeprimo¶

Once you have your API user successfully created, you'll need to contact our support to enable the Tulo Paywalls feature. When contacting our support, the following information must be provided:

API Key: Can be found and copied in your API user settings.

Step 2¶

Create your first Tulo Paywall¶

Once Tulo Paywalls have been enabled, you will be able to navigate to Marketing => Paywalls in the PAP and create your first paywall. To get started, we recommend you check out our guide in creating a Tulo Paywall.

Step 3¶

Preparing your site¶

Great job! If you got this far, you got your API user ready to go, and your first Tulo Paywall standing by. To start using your paywall, it will now have to be embedded on your site.

Include our CSS¶

For the Tulo Paywall to render correctly, you will need to include our CSS on your site. The CSS defined in this file can of course be overridden in your own CSS if you wish to do so. Choose the correct file, depending on what environment you are working in.

Environment	URL
Production	https://payway-cdn.worldoftulo.com/css/paywall.css
Staging	https://payway-cdn-stage.adeprimo.se/css/paywall.css

Include our Javascript¶

For the Tulo Paywall to function as it should, you will need to include our JS on your site. Choose the correct file, depending on what environment you are working in.

Environment	URL
Production	https://payway-cdn.worldoftulo.com/js/paywall.js
Staging	https://payway-cdn-stage.adeprimo.se/js/paywall.js

Step 4¶

Generating a JWT Token¶

All information exchanged between the Tulo Paywall JS and the paywall is transmitted in JSON Web Tokens (JWT) that are signed and encoded. The JWT is signed using your API Client secret, both ways, which enables both your website and Payway to verify that the token has not been tampered with and that it originates from the correct sender, in possession of the shared secret. For details about creating, signing, verifying, encoding and decoding JWT please read more on JWT.io.

A decoded JWT might look like this:

{
  "alg": "HS256",
  "typ": "JWT"
}
{
  "iss": "57221f11584d54e28b000001",
  "aud": "pw-paywall",
  "nbf": 1603455793,
  "exp": 1603542193,
  "iat": 1603455793,
  "aid": "63cfafea09c04c30c9e17c21",
  "t": "TITLE_CODE"
}

Claim	Type	Description	Required
iss	string	Issuer should be your Tulo Paywall API user Client ID from Step 1.	Yes
nbf	int(epoch)	Not before should be the epoch timestamp of when this token is created.	Yes
exp	int(epoch)	Expires should be the epoch timestamp for 60 seconds after the token was created.	Yes
iat	int(epoch)	Issued At should be the epoch timestamp of when this token is created.	Yes
aud	string	Audience should always be "pw-paywall".	Yes
t	string	Title is the title code for the site the Tulo Paywall is being initialized.	Yes
aid	string	Account ID of the logged in user. Exclude or leave empty for anonymous.	No

Step 5¶

Embedding your Tulo Paywall¶

To embed your Tulo Paywall, you will first need to define an HTML container where the paywall should live. This container can be anywhere on your site, though we recommend you give it plenty of space.

<div id="paywall-container"></div>

Afterwards, you can initialize the Javascript, that will take care of embedding your paywall into the container:

<script type="text/javascript">
    new Paywall().Init({
        url: "https://paywall-stage.adeprimo.se/api/paywall",
        jwtToken: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
        debug: false
        ....
        ....
        ....
    });
</script>

Paywall.Init example

When initializing the Tulo Paywall script, an url and jwtToken must be provided.

Tulo Paywall URL¶

Choose the correct url, depending on what environment you are working in.

Environment	URL
Production	https://paywall.worldoftulo.com/api/paywall
Staging	https://paywall-stage.adeprimo.se/api/paywall

However, if you would like to take this one step further, some optional attributes can also be provided:

Available attributes¶

Attribute	Type	Description	Required
url	string	Tulo Paywall URL	Yes
jwtToken	string	Generated server side in Step 4	Yes
debug	boolean	Set to true for additional information when troubleshooting	No
accountOrigin	string	Read more about Account origin	No
trafficSource	string	Read more about Traffic source	No
merchantReference	string	Read more about Merchant reference	No
returnUrl	string	Read more about Return url	No
backUrl	string	Can be used as an alternative link back to the website from Tulo Shop, not to be mistaken for the returnUrl.	No
utmSource	string	GA support	No
utmMedium	string	GA support	No
utmCampaign	string	GA support	No
utmContent	string	GA support	No
resources	object	Overridable text resources. You'll find the available resources and default values here.	No
engageTracking	object	Engage BI tracking meta data	No
articleId	string	If the Tulo Paywall is initiated from an article add the articleId to this parameter.	No
categories	array	Categories e.g. ["cat 1", "cat 2"]	No
sections	array	Sections e.g. ["sec 1", "sec 2"]	No
onError	function	Callback if a Tulo Paywall error occurs. Will override default onError behaviour. Read more here.	No

Text resources¶

There are several overridable text resources available. Here you'll find which they are and when and where they occur.

Property	Type	Default value	Description
loadingText	string	Loading...	Text shown under the loading icon when the Tulo Paywall UI is rendering
errorHeader	string	An error has occurred	The header shown when an error occurs
errorDescription	string	Something unexpected happened. Please try again later, and if the problem persists, contact support.	The description shown when an error occurs

Error handling¶

If an error within the Tulo Paywall occurs, an onError function will be triggered. By default, this means that an error will be shown to the end-user, and you will receive debug information (granted the debug flag is set to true) in the browser console.

If you would like to override this behaviour, you can simply define an onError function when initializing the paywall. Furthermore, the function should accept one argument, in the form of the exception that was thrown. The exception that is thrown will always contain the following information:

Property	Type	Description
name	string	Will always be set to "PaywallError"
code	string	The error code that was thrown
field	string	The field relating to the error that was thrown
pwCorrelationId	string	The correlation ID of the error. If you contact our support regarding a Tulo Paywall error, this ID should always be included in the support request.
toString	function	Returns a stringified version of the error.

The default error that is shown to the end user will always look like the following, though the text resources are customizable via the resources property.

Tulo Paywall Error

Step 6¶

Test & go live¶

Once everything above is said and done, we highly recommend you take some final steps before publishing your Tulo Paywall to a production environment:

Test your Tulo Paywall and implementation in a testing/staging environment.
Make sure the Tulo Paywall renders correctly, and no errors in the browser console are shown.