We’ve now finished this off, so it should work at both old and new-style fuel pumps. 
Old-style pumps authorize £1 and update in a few days
Most Pay at Pump machines today authorize £1. They will look like this in the feed:
If you tap through, you’ll see the following message on the transaction:
This payment hasn’t been finalised yet. The actual amount you’ll pay will be shown in a few days.
You’ll get the following series of notifications. The “amount updated” one will appear a few days later.
New-style pumps authorize £99 and update within 20 minutes
Pay at Pump works differently in Europe, and UK pumps are slowly being updated to match. The new pumps authorize £99, which will look like this:
The message on the transaction screen will read:
This payment hasn’t been finalised yet. The actual amount you’ll pay will be shown soon.
And you’ll get the following series of notifications. The “amount updated” one should appear within 20 minutes.
