Setting test mode for your store
From Shopify admin, go to 'Settings > Payments'
In Shopify Payments section, click 'Manage'
In Test mode section, select 'Enable test mode'
Use the following test card details:
Card type: VISA
Card number: 4242424242424242
Name on card: Enter at least two words
Expiry date: Enter any date in the future.
Security code: Enter any three digits.
After test mode is turned on, place a test order to view your store's certificates
Send the certificate to an email address you own as you must delete the test certificate
After viewing the test certificate, please delete it. You will need to create a free Verisart account with the email address the certificate was sent to.
Learn more about How to delete a certificate.