If you've switched companies and can no longer access your email address, don't worry - you don't need to have access to your previous email or inbox in order to reset your password!
Step 1: Go here to initiate a password reset via text message and enter the previous/last known email address that was associated with your Cardtapp account. Do not enter your new email address as you will update this in a later step once logged in to your account.
Step 2: Within 5 minutes, you should receive a text message with a six-digit code that you will use to complete the password reset.
Step 3: Enter the one-time code sent to the mobile number associated with your Cardtapp account.
Step 4: Enter your new password and confirm your new password.
Here's an article that walks through how to reset your password and login recovery in more detail.