Create Transaction

Map<String, Object> chargeData = new Map<String, Object>();
        chargeData.put('processorCustomerId', 'processorCustomerId'); 
        chargeData.put('paymentMethodId', 'paymentMethodId'); 
       
        chargeData.put('amount', '123.12'); 
        chargeData.put('chargeCurrency', 'USD'); 
        chargeData.put('description', 'test payment'); 
        chargeData.put('paymentMethodType', 'Card'); 
                
        //  Initializing the RequestJSON Data to be passed.
        Map<String, Object> requestJSONMap = new Map<String, Object>();
        requestJSONMap.put('transactions', new List<Object>{chargeData});
        String reqJSON = JSON.serialize(requestJSONMap);
        
        Map<String, Object> reqObj = new Map<String, Object>();
        reqObj.put('version','1.0');
        reqObj.put('action','ChargeProcessor');
        reqObj.put('processorId', 'processorId');
        reqObj.put('requestJSON',reqJSON);
        
        //  Placing a request to Breadwinner Global API
        Map<String,Object> resp = bw_payments.BreadwinnerPaymentsAPI.call(reqObj);
        System.debug(resp);