SIM Payment Gateway

The SIM payment gateway will allow your attendees/registrants to pay for their event registration with a credit or debit card on a secure webpage, hosted on

View quick links for this payment gateway –> 

Need to Buy a Support License for the SIM Payment Gateway for Event Espresso 4?


This add-on requires Event Espresso 4.6 or newer. It cannot be used with old versions of Event Espresso 4.

This payment gateway is a plugin for WordPress and can be installed through your WP dashboard (WP-admin).

Download the latest version of the SIM payment gateway for Event Espresso 4 from your Event Espresso account.

Then login to your  WordPress dashboard (WP-admin) and go to Plugins. Next, click on Add New –> Upload and browse to the plugin on your computer. Then select the zip file and begin the upload process. Wait for the plugin to upload and then click on Activate.

Switch from SIM to Accept is closing down their SIM service. They recommend switching to Accept.

Here is an overview of the steps to make the switch to Accept. These steps will take 5 to 10 minutes to complete:

  1. Login to your merchant account and enable Transaction reporting
  2. Download Accept from your account page
  3. Upload and activate Accept through your WordPress plugins screen in your WP-admin (WP dashboard)
  4. From your WordPress dashboard, go to Event Espresso → Payment Methods and click on Accept
  5. Now click on the button to activate Accept
  6. From the top of your screen, immediately click on SIM and scroll down and look for the API Login ID and copy it
  7. Click on Accept and paste in the API Login ID that you just copied.
  8. Now click on SIM and then look for the Transaction Key and then copy it
  9. Click on Accept and paste in the Transaction Key and then save changes by scrolling down and clicking on the button
  10. Now switch back to SIM and then scroll down and click to deactivate it

Setup and Configuration

An account with is needed to accept payments via

A dedicated SSL certificate is recommended to make registration checkout and other areas of your website more secure.

Login to your  WP-admin (WP Dashboard) and go to Event Espresso –> General Settings –> Payment Methods. Once on the Payment Methods screen, click on and click on the button to activate the payment method.


Below are the available fields and explanations for each field.

Name – This is the name of the payment method.
Description – This description is shown during registration checkout.
Admin-Only Name – This is a name of the payment method that will only be shown in the WP Dashboard (WP-admin).
Admin-Only Description – This description is used only in the WP Dashboard (WP-admin).
Debug Mode On? – Enables debugging for this payment method. It should be off (set to no) on a live/production site.
Open by Default? – This sets this payment method to be pre-selected on the registration checkout page.

To give your audience more payment options, you can activate multiple payment methods at the same time. However, if you are offering just one payment option, then we recommend that you set that one payment method to be selected by default during registration checkout. That will simplify the check out process for your attendees. API Login ID – This credential is needed to process payments and can be found in your account. Transaction Key – This credential is needed to process payments and can be found in your account.
PMD Order – The value (number) can be used to sort or arrange this payment option. A lower value means that it should appear first during registration checkout.
Button URL – This is the URL to the image that will be used during the payment process of registration checkout.
Alternative Button URL:
Pay by bank card
Usable From? – Select where this payment method should be available for use. This payment method cannot process payments through the WP-admin (WP Dashboard).
Update Settings – Click this button after making any changes to your payment method.
Deactivate Payment Method – Click this button to deactivate this payment method.


The SIM payment gateway will let you accept payments via major credit or debit cards.

This is an offsite payment gateway which means that attendees/registrants will process their payment on a secure webpage on

An account with is needed to accept payments via


I configured SIM and payments are not being processed. Can you help?
First, double-check that you are using your API credentials for production (live) mode which are different than your login information for your account. Also, ensure that there is no extra spacing before or after the credentials in the payment methods screen of Event Espresso 4.

How can I setup a recurring payment or subscription through SIM?
Recurring or subscription payments are not currently supported in the SIM payment gateway.

When I refund a payment, does it also refund through
Refunds in Event Espresso 4 are currently a two step process. First, apply the refund through the transactional details screen of Event Espresso in your WP-admin (WP dashboard). Then login to your merchant account and process the refund.

Is an SSL certificate needed for Authorizenet SIM?
A dedicated SSL certificate is recommended if you are accepting payments on your website.

Do I need to be PCI compliant?
Compliance with the Payment Card Industry Data Security Standards ( PCI DSS) is required if you are processing, storing, or transmitting credit card data. Event Espresso recommends using a dedicated SSL certificate on your website.

View more information on PCI compliance from Authorize.Net.


Our support team cannot write custom coding for you. Below are some examples on customizing this payment gateway.
  • None at this time — check back soon!

Need to Buy a Support License for the SIM Payment Gateway for Event Espresso 4?

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