Hi Dennis we sent our API over the internet but had a bit of trouble as there are 2 numbers with Thomson as they use 2 numbers
1- Your booking reference, which is no good to send your API but to use for any payments you make or alterations to your holiday
2- Your booking reference number, found at the bottom of the confirmation Email which is the 1 you require to forward your API
Heres an example of the confirmation email with the place your booking reference number is
Important Information
This email confirm that you have agreed to our Terms and Conditions
**Important API Requirements - All passengers must comply**
Airlines are now required to provide passenger details to government authorities in advance of travel for the purpose of border control. This includes information contained within your passport. For passengers travelling to the US, you will be required to provide your first night address.
You must provide this data between 6 months and 24 hours prior to your departure by visiting
http://eapi.thomson.co.uk quoting booking reference number [1234567]. Customers travelling within 4 days of booking will be unable to use the online facility, so will therefore be required to provide the necessary information upon check-in at the airport.
Failure to provide this information may result in you being unable to travel.
Get more information on API
Hope this makes sense
Tony