Israeli officials inserted into the Nimbus deal a requirement for the companies to a send coded message – a “wink” – to its government, revealing the identity of the country they had been compelled to hand over Israeli data to, but were gagged from saying so.

Leaked documents from Israel’s finance ministry, which include a finalised version of the Nimbus agreement, suggest the secret code would take the form of payments – referred to as “special compensation” – made by the companies to the Israeli government.

According to the documents, the payments must be made “within 24 hours of the information being transferred” and correspond to the telephone dialing code of the foreign country, amounting to sums between 1,000 and 9,999 shekels.