The first document set is the signed player contract and every amendment. Mark the provisions on special remuneration, the service period, the due date and the end of the relationship. Oral explanations should be compared with written confirmation or the messages available to you.
Add payslips, bank statements or payment confirmations and all documents concerning the end of the employment relationship. This may include a termination notice, a termination agreement, a fixed-term clause or a written statement of the end date. Arrange the documents chronologically.
A comparison table can list the contractual amount, service period, service time completed, due date, amount accounted for and open difference. This separates a calculation question from the separate question whether the clause was validly agreed or a payment was finally settled.