Plugins built using the Plugin Framework use the Authentication Framework to provide secure authentication.

See the Consumer API - OAuth and OpenID Connect and Authentication Framework docs for details.


The Plugin Framework is implemented in Banno’s UI via iframes that render individual plugins.

Web browsers have become increasingly restrictive on cross-site cookie tracking and this affects how cookies can be used within a plugin.


When developing a plugin, you may want to set your browser settings as follows.


This is not a solution that will work for Production usage.

  • For Chromium-based browsers, you’ll have to configure the browser to allow 3rd party cookies.
  • For Firefox, you’ll have to enable 3rd party cookies.
  • For Safari, you’ll have to disable the “Prevent cross-site tracking” option.


When you are ready to use your plugin in Production:

If you need to write a cookie in the plugin, you’ll need to host your public-facing web server at a subdomain of the Banno Online domain name for your financial institution.

For example, assume you have the following URLs for your financial institution:

  • Main (marketing) website:
  • Banno Online website:

You could host the plugin at a subdomain named “plugin” which would give you:

  • Plugin domain:

In our browser testing, this subdomain setup is recognized by all browsers and the cookies are not treated as 3rd party cookies.

Browsers and same-origin policy

When using subdomains to host your public-facing web server , keep in mind that browsers will enforce security mechanisms such as the same-origin policy.

Quoted from the same-origin policy docs on MDN Web Docs:

Definition of an origin

Two URLs have the same origin if the protocol, port (if specified), and host are the same for both. You may see this referenced as the “scheme/host/port tuple”, or just “tuple”. (A “tuple” is a set of items that together comprise a whole — a generic form for double/triple/quadruple/quintuple/etc.)

The following table gives examples of origin comparisons with the URL

URL Outcome Reason Same origin Only the path differs Same origin Only the path differs Failure Different protocol Failure Different port (http:// is port 80 by default) Failure Different host

HTTPS, Certificates, and Certificate Authorities

You’ll have to take care to ensure that the Certificate Authority (CA) and intermediate certificates are configured correctly for your plugin server’s SSL certificate.

An incorrect configuration may result in your plugin’s content failing to display within Banno Online and Banno Mobile.

External Resources

If you want to learn more about handling cookies in your web browser, these external resources may be useful:

If you want to learn more about browser same-origin policy: