WCS - Websphere Commerce Space

Here I am going to share my recent experience in debugging a payment related issue. This issue started occurring all of a sudden without any recent changes to the code. All the orders were failing after entering the payment information. Error log for the issue was as below. [9/27/17 0:31:23:137 EST] 0000002e CommerceSrvr A AEDPPIEditCtrlCmdImpl getOrderIdByEDPPIID Object of type payment instruction with primary key 79,172 could not be found in the database. [9/27/17 0:31:23:139 EST] 0000002e ExtendedInfo I CWXFR9010I: Extended information : [URL=http://localhost/webapp/wcs/stores/servlet/webapp/wcs/stores/servlet/XPaymentProcessCmd] [parameters=signature=+Yuun7p7fwRo6hgHvdf4CBz2lNvrKUN/BtKbQZgFsue= encryptedparameters=2SDSwUkztXgotmmLbKuB+P2ZoiX1Rd65ai3932yezsdHLI2wb1deUvHoNKzaP9KvXsedZd0SgLBWjv+COHyZXTLyFEDXBcfCcYBFzkgTc2JdTl3XAjKai4KbGp0sJ8haesjbeZKIavF6AK7LjdsF05guWvsEkQ6ymn7OvK9UvLrIQDTT1/UNW4i9G/qXJ3WIYp3H8E1BCHS+HfFj/1wS/ORpartRTNxwYCloHwT4qjPVr/toH2LWtzNTICMEdgJ4We+SzSS...

Couple of months back in my work I was assigned with an issue of Add to cart not working in our toolkit environment. The error logs was like below. [8/1/17 16:43:34:296 CEST] 0000015c CommerceSrvr A com.ibm.commerce.orderitems.commands.ResolveOrderItemPriceCmdImpl handleNullPriceException CMN1011E: Unable to retrieve the price for catEntry 420472, quantity: 1.0, unit of measure: C62, and currency: null. [8/1/17 16:43:34:297 CEST] 0000015c ExtendedInfo I CWXFR9010I: Extended information : [URL=http://localhost/webapp/wcs/stores/servlet/AjaxOrderChangeServiceItemAdd] [parameters=calculationUsage=-1,-2,-3,-4,-5,-6,-7 orderId=. quantity=1 catalogId=15451 langId=-1 catEntryId=420472 storeId=11352 ] [userId=-1002] [8/1/17 16:43:34:298 CEST] 0000015c MessageMappin C com.ibm.commerce.foundation.server.command.soi.MessageMappingCmdImpl createBusinessObjectDocumentResponse(CommandProperty, ControllerCommand) No customized message mapping error or response cmd found for errorCommand: ...