Defendant twice failed to pay arbitration fees within 30 days after they became due. Once it timely paid all but $250 of the billed arbitration fees, contending that the remaining $250 was plaintiff’s to pay as an initial arbitration fee. But plaintiff had already paid $250, so another payment of that sum would exceed the arbitration agreement’s $400 limit on fees to be paid by the employee. Paying less than the full amount of arbitration fees due within 30 days is a material breach of the arbitration agreement under CCP 1281.98(a)(1). Substantial compliance does not suffice. The second time, the defendant failed to pay within 30 days in 2022 after an amendment to CCP 1281.98(a)(2) clarified that arbitration fees are due on receipt of the invoice and the due date may be extended only by agreement of all parties–i.e., the arbitration administrator and both parties to the arbitration. An extension agreed to only by the arbitration administrator is no longer effective. Plaintiff did not waive his right to cancel the arbitration by continuing to pursue the arbitration after the defendant’s payment defaults because the arbitration administrator didn’t disclose the payment defaults.