On September 5, 2023, CSG Systems International, Inc. entered into the Second Amendment to its $600 million Amended and Restated Credit Agreement, dated September 13, 2021 (as amended by the First Amendment, dated as of April 12, 2023, the ?2021 Credit Agreement?), by and among the Company, the subsidiary guarantors party thereto, Bank of America, N.A., as the administrative agent, collateral agent, swingline lender, and an issuing bank, and the other lenders and issuing banks from time to time party thereto. The Second Amendment amends the 2021 Credit Agreement to permit the issuance and sale of the Notes and the related capped call transactions. All of the other material terms, provisions, and conditions of the 2021 Credit Agreement remain unchanged.