Shift4 is an acquirer, headquartered in Hafnarfjörður, Iceland.
Caution
Please be aware of these prerequisites before starting the setup.
You need to be already live with Frisbii Pay. It will not work in test mode.
Please set up a Shift4 account first.
Set up Shift 4 in Frisbii
Open Configurations → Checkout management → Payment methods.
Click on Credit card agreement.

Scroll and click on Shift4.
Select payment methods you would like to use.
Fill out the form:
Field
Information to put in
Merchant id
Shift4 Gateway MID. Looks like this: 10082933
Merchant Signature Key
Shift4 Authentication key. Looks like this: 1987654321098abczxy
Merchant Name
Your company information.
Merchant Address
Merchant City
Merchant ZIP code
Merchant Country
Business Code
MCC code (Business code). Looks like this: 8421
Merchant website
Do not forget to put http://
3D Merchant ID
Shift4 CAID. Looks like this: 100000000089123
Amex merchant ID
American Express Merchant ID, if you have been receiving Paper statements, your Merchant Account number can be found at the top right corner of the statement. It is also included at the top right corner of any email sent to you from American Express regarding your Online Merchant Account.
Click on Create in the top right corner.