What is the contention between Arsenal and West Ham that prompted the announcement of Declan Rice's contract?

The West Ham United football team is growing increasingly frustrated with Arsenal's reluctance to finalize the deal for Declan Rice, which was agreed upon during the first week of the summer transfer market. Despite the Hammers agreeing to sell Rice to Arsenal for a staggering £105 million, the Gunners have yet to complete the transaction.
The agreed deal outlined a payment structure, with £100 million to be paid upfront, and an additional £5 million contingent on Rice's performance at the Emirates Stadium and his success with Arsenal.
Reports from British media indicate that Arsenal's lawyers have not yet signed the contract, despite individual terms being agreed upon, and Rice successfully passing the medical examination. This delay in finalizing the deal has left West Ham frustrated and disappointed with Arsenal's handling of the situation. The Hammers feel that Arsenal's actions are stalling their own efforts to sign new players and are causing unnecessary delays in receiving the payment for Rice's transfer.
As part of their plan, West Ham intended to secure the signing of Harvey Barnes from Leicester City. However, the delay caused by Arsenal's indecision on the Declan Rice deal has opened the door for Newcastle United to pursue Barnes. Additionally, Fulham's Joao Palhinha had also been on West Ham's radar, but the uncertainty surrounding Rice's transfer has kept the Portuguese midfielder from making a move.
With time ticking in the summer transfer window, West Ham is now keen on resolving the situation with Arsenal swiftly. They aim to avoid further complications in their own transfer dealings and ensure that they receive the agreed-upon payment for the transfer of their prized asset, Declan Rice.
The developments surrounding the Rice deal have added tension and complexity to the transfer market for all parties involved. As negotiations continue, West Ham hopes for a resolution that benefits both clubs and allows them to proceed with their transfer plans in a timely and efficient manner.