In response to a Freedom of Information request here is a (scanned) pdf of the Slovenian Government contracts with Pfizer for their Covid vaccines.
Note that there are 4 different contracts here dated 10 Dec 2020, 4 March 2021, 7 April 2021 and 28 Sept 2021. The documents show the number of doses ordered per month (but the price is redacted). But, note that even the latest of these contracts (dated 28 Sept 2021) contains the following statement in Article 1 (it's on page 17/25 of the scanned document)
"The ...State further acknowledges that the long-term effects and efficacy of the Vaccine are not currently known"
While that may have been a reasonable statement to include in the December 2020 contract, it is curious that no update at all had been added by the end of September 2021 given all the data on hundreds of millions of doses that had been adminstered by then.
Regarding the Pfizer contract with the UK (which presumably has the same wording) it is very interesting to note that this UK Government report ("Conditions of Authorisation for COVID-19 Vaccine Pfizer/BioNTech (Regulation 174", updated 16 Aug 2022) says:
"Pfizer/BioNTech must provide a regular analysis of safety data based on the MHRA’s specifications relating to booster or supplementary doses"
I assume we are still waiting....