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GatewaySettlementReconciliationBatch settlement = new GatewaySettlementReconciliationBatch();
String cronExp = '0 30 3 * * ?';
System.schedule('[PosiPay] Gateway Settlement Reconciliation', cronExp, settlement);

For Testing only

Create a Screen Flow
Go to Setup > Flow > Screen Flow > Add Element > Screen > Components > PosiPay Settings > Save > Debug > Run > check the job under the Apex Jobs
API Name: PosiPay_Settings_Gateway_Settlement

Flow Label: Gateway Settlement Schedule

Flow API Name: autopopulated

Next place to go: Step 7 - Set up Stripe Payment Flow

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