123FormBuilder and Marketo Integration

Use the 123FormBuilder – Marketo integration to send leads to one or more lists from your Marketo account. Go to the Integrations section of your form and search for Marketo using the search bar and hit Connect to install the application on your form.

Provide your Rest API Key, Client Id, and Client Secret to proceed to the customize settings phase.

Note: You need at least one existing mailing list in Marketo for the integration to work.

Connect | Customize


To retrieve the Client Id and Client Secret, you’ll need to create a custom service in your Marketo account. Here’s how you do it:

1. In your Marketo account, go to Admin and click on Users & Roles, on the left.

123formbuilder marketo integration

2. Click on the Role tab (on top) and hit New Role.

123formbuilder marketo integration

3. In the Create New Role lightbox, type in a Role Name and go to Permissions (third box below). Check the option Access API and deselect the sub-options below, except Read-Only Lead, Read-Write Activity, and Read-Write Lead. Next, press Create.

123formbuilder marketo integration

4. Now go to the tab Users and click on Invite New User. Provide a name and email address of the API only user, select the newly created role, and tick the checkbox API Only. In the end, click on Invite.

123formbuilder marketo integration

5. You’ll now be required to create a custom application. Go to AdminLaunchPoint and create a new service.

123formbuilder marketo integration

6. In the lightbox, enter a name and select an API Only user in the dropdown list below. Notice that only users that are API only are displayed. Hit Create to exit the lightbox and go to View Details to retrieve the Client Id and Client Secret needed for your 123FormBuilder – Marketo integration.

123formbuilder marketo integration

7. To find the Rest API, go to AdminWeb Services and you’ll find it within the Rest API box. It’s the series of characters displayed at End Point and Identity as shown in the example below:

123formbuilder marketo integration

This concludes the steps in retrieving the Rest API, Client Id, and Client Secret for the 123FormBuilder – Marketo integration. Return to your 123FormBuilder account, go to your form, paste the three codes in the Marketo application box, and hit Connect to continue.

123formbuilder marketo integration

123formbuilder marketo integration

Go to Customize to set up your 123FormBuilder – Marketo integration. Here you can select one of the two available actions: Add subscriber and Unsubscribe email. Below, select a list from your Marketo account where new leads will be sent on submission. You can send the same lead to multiple lists on the same submission.

Use the Update existing subscriber option if needed and start mapping 123FormBuilder fields with Marketo fields and custom fields in the Field subsection. Remember to set the Email field as required on the form in order for the integration to work properly. In the end, use the Email Handling for problems that might occur during submission, such as a bad network connection on the submitter’s side that would prevent the lead to be created in Marketo.

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Frequently Asked Questions

Here is a list of the most frequently asked questions. For more FAQs, please browse through the  FAQs page.

Is this service free?
Yes, we offer a free form builder service. Just sign up to the Basic plan and you are all set. This plan is forever free, but you are limited with a few features only, such as 5 forms per account, 100 submissions per month and you have to keep the backlink to 123FormBuilder on your forms. Check out our features matrix for more information.
How many forms can I create?
It depends on the service plan you are on. Higher service plans enable more features, including more web forms for your account. If you need more forms, go to the My Account section of your account and click the upgrade button. To create an unlimited number of forms, either upgrade to the Platinum service plan or higher. Consult our features matrix for more information.
How can I publish my forms?
You can publish your forms in many ways, by using their direct URL or HTML link, embedding them with a JavaScript code, Inline HTML or iFrame, using the Facebook app or the WordPress plugin, using popups, the Blogger code snippet and many more. Once you have created and customized your form, go to the Publish section to complete your work. Read more in our documentation.
How do I change my form design?
You can change the design of your form for more information. in the Themes section, which is located in your form settings. We offer a set of more than 30 predefined form themes for your forms, but you can also create your own from scratch. You can customize the submit button, the logo and more. To apply your own stylesheets, all forms come with a custom CSS editor.

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