Set up a Payment Customisation
Steps 1 & 2: Copy the Block ID and Go to “Settings”.
Copy the Block ID that is displayed after saving. Then on the left corner click on “Settings”.
Step 3 & 4: Select “Checkout” and Click on “Customize” Button
From settings select Checkout and then in Checkout click on the “Customize” button.
Step 5: Click on the “Add app block” button.
Now you are in the checkout profile click on the “Add app block” button in the left bottom corner.
Step 6: Select the “Custom Block”.
Select the “Custom Block” from the displayed blocks.
Step 7 & 8: Paste the Block ID and Save
As the last step paste the copied Block ID and Save the changes.
Now the block is live you can see