Order to Cash / Procure to Pay

Workflow Overview

The Order-to-Cash flow involves four key transaction types:

┌─────────────┐     ┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│   850 PO    │────▶│   855 POA   │────▶│   856 ASN   │────▶│ 810 Invoice │
│ (Retailer)  │     │ (Supplier)  │     │ (Supplier)  │     │ (Supplier)  │
└─────────────┘     └─────────────┘     └─────────────┘     └─────────────┘
     │                    │                    │                    │
     │                    │                    │                    │
   Buyer              Confirm              Ship goods            Bill for
  places              receipt &            & notify               goods
   order              acceptance                                 shipped
StepTransactionDirectionPurpose
1850 Purchase OrderInboundRetailer orders products
2855 PO AcknowledgmentOutboundYou confirm/modify the order
3856 Advance Ship NoticeOutboundYou notify shipment details
4810 InvoiceOutboundYou bill for shipped goods

Step 1: Receive the Purchase Order (850)

Detect New Orders

Using the Inbox (v4):

curl -X GET "https://api.orderful.com/v4/inbox?transactionType=850" \
  -H "orderful-api-key: YOUR_API_KEY" \
  -H "orderful-version: v4"

Using Polling (v3):

curl -X GET "https://api.orderful.com/v3/transactions?direction=inbound&transactionType=850&deliveryState=pending" \
  -H "orderful-api-key: YOUR_API_KEY"

Get the Full PO Content

curl -X GET "https://api.orderful.com/v3/transactions/12345/message" \
  -H "orderful-api-key: YOUR_API_KEY"

Example Response:

{
  "purpose": "original",
  "purchaseOrderType": "standalone",
  "purchaseOrderNumber": "PO-2024-001234",
  "purchaseOrderDate": "2024-01-15",
  "releaseNumber": "REL-001",
  "contractNumber": "CNT-2024-ABC",
  "acknowledgmentType": "withDetail",
  "conditionsAndRestrictions": [
    {
      "conditionType": "shipComplete",
      "action": "confirm",
      "services": "twoDayService",
      "maxOrderValue": "50000.00"
    }
  ],
  "parties": {
    "buyer": {
      "name": "Acme Corporation",
      "additionalName1": "Procurement Department",
      "identificationCode": "123456789",
      "identificationCodeType": "duns",
      "addressLine1": "123 Main Street",
      "addressLine2": "Suite 500",
      "city": "Chicago",
      "stateOrProvinceCode": "IL",
      "postalCode": "60601",
      "countryCode": "US",
      "zoneType": "commercial",
      "contacts": [
        {
          "type": "primary",
          "name": "John Smith",
          "phoneNumber": "312-555-0100",
          "email": "[email protected]"
        },
        {
          "type": "orderInquiry",
          "name": "Order Desk",
          "phoneNumber": "312-555-0200",
          "email": "[email protected]"
        }
      ]
    },
    "shipTo": {
      "name": "Acme Corporation - Warehouse",
      "identificationCode": "987654321",
      "identificationCodeType": "duns",
      "addressLine1": "456 Warehouse Boulevard",
      "city": "Elk Grove Village",
      "stateOrProvinceCode": "IL",
      "postalCode": "60007",
      "countryCode": "US",
      "zoneType": "commercial",
      "contacts": [
        {
          "type": "receiving",
          "name": "Receiving Department",
          "phoneNumber": "847-555-0300"
        }
      ]
    },
    "billTo": {
      "name": "Acme Corporation",
      "identificationCode": "123456789",
      "identificationCodeType": "duns",
      "addressLine1": "123 Main Street",
      "addressLine2": "Accounts Payable",
      "city": "Chicago",
      "stateOrProvinceCode": "IL",
      "postalCode": "60601",
      "countryCode": "US"
    },
    "shipFrom": {
      "name": "Global Suppliers Inc.",
      "identificationCode": "555123456",
      "identificationCodeType": "duns",
      "addressLine1": "789 Manufacturing Drive",
      "city": "Dallas",
      "stateOrProvinceCode": "TX",
      "postalCode": "75201",
      "countryCode": "US"
    },
    "accountsPayable": {
      "name": "Acme Corporation - AP",
      "addressLine1": "123 Main Street",
      "addressLine2": "Finance Department",
      "city": "Chicago",
      "stateOrProvinceCode": "IL",
      "postalCode": "60601",
      "countryCode": "US"
    },
    "soldTo": {
      "name": "Acme Corporation",
      "identificationCode": "123456789",
      "identificationCodeType": "duns",
      "addressLine1": "123 Main Street",
      "city": "Chicago",
      "stateOrProvinceCode": "IL",
      "postalCode": "60601",
      "countryCode": "US"
    },
    "supplier": {
      "name": "Global Suppliers Inc.",
      "additionalName1": "Sales Division",
      "identificationCode": "555123456",
      "identificationCodeType": "duns",
      "addressLine1": "789 Manufacturing Drive",
      "city": "Dallas",
      "stateOrProvinceCode": "TX",
      "postalCode": "75201",
      "countryCode": "US",
      "zoneType": "commercial",
      "contacts": [
        {
          "type": "primary",
          "name": "Sarah Johnson",
          "phoneNumber": "214-555-0400",
          "email": "[email protected]"
        }
      ]
    }
  },
  "buyersCurrency": {
    "currencyCode": "USD",
    "exchangeRate": "1.00"
  },
  "sellersCurrency": {
    "currencyCode": "USD",
    "exchangeRate": "1.00"
  },
  "notes": {
    "general": {
      "description": "General order notes",
      "text": [
        "Please ensure all items are properly packaged",
        "Include packing slip with shipment"
      ]
    },
    "orderInstructions": {
      "description": "Order specific instructions",
      "text": [
        "All items must be shipped together",
        "Use standard carrier for delivery"
      ]
    },
    "shippingInstructions": {
      "description": "Shipping instructions",
      "text": [
        "Deliver during business hours only",
        "Contact receiving department 24 hours before delivery"
      ]
    }
  },
  "paperwork": [
    {
      "reportType": "materialDataSheet",
      "reportTransmissionType": "withShipmentPackage",
      "copiesNeeded": 2,
      "isoLanguageCode": "en",
      "description": "Material safety data sheets required"
    },
    {
      "reportType": "technicalInformation",
      "url": "https://example.com/tech-specs",
      "description": "Technical specifications available online"
    }
  ],
  "packaging": [
    {
      "characteristicType": "palletType",
      "description": "Standard 48x40 pallets required",
      "unitLoadOption": "palletized"
    },
    {
      "characteristicType": "shippingPackageLabeling",
      "description": "Include PO number on all labels",
      "agencyType": "uniformCodeCouncil"
    }
  ],
  "termsOfSale": {
    "type": "basicDiscountOffered",
    "basisDate": "invoiceDate",
    "discountPercent": "2.0",
    "discountDaysDue": 10,
    "discountDueDate": "2024-02-25",
    "netDaysDue": 30,
    "netDueDate": "2024-02-15",
    "discountAmount": "200.00",
    "description": "2/10 Net 30 payment terms",
    "paymentMethodType": "check"
  },
  "references": {
    "accountNumber": {
      "value": "ACC-12345",
      "description": "Buyer account number"
    },
    "customerOrderNumber": {
      "value": "CUST-ORD-789",
      "description": "Customer order reference"
    },
    "vendorNumber": {
      "value": "VND-456",
      "description": "Vendor number"
    },
    "departmentNumber": {
      "value": "DEPT-10",
      "description": "Department code"
    },
    "storeNumber": {
      "value": "STORE-001",
      "description": "Store location"
    },
    "promotionNumber": {
      "value": "PROMO-2024-Q1",
      "description": "Promotion identifier"
    }
  },
  "dates": {
    "purchaseOrderDate": "2024-01-15",
    "requestedShipDate": "2024-02-01",
    "requestedDeliveryDate": "2024-02-05",
    "earliestShipDate": "2024-01-28",
    "latestShipDate": "2024-02-05",
    "earliestDeliveryDate": "2024-02-01",
    "latestDeliveryDate": "2024-02-10",
    "cancelAfterDate": "2024-02-15",
    "customerOrderDate": "2024-01-10"
  },
  "carrierDetails": {
    "routing": [
      {
        "sequenceType": "origin",
        "standardCarrierAlphaCode": "FEDX",
        "transportationMethod": "commonCarrier",
        "locationType": "origin",
        "location": "Dallas, TX",
        "serviceLevel": "ground",
        "transitDirectionType": "sellerToBuyer",
        "transitTimeType": "workingDays",
        "transitTime": "3"
      }
    ],
    "freeOnBoard": [
      {
        "methodOfPayment": "prepaidBySeller",
        "locationType": "origin",
        "locationDescription": "Dallas, TX",
        "titlePassageType": "origin",
        "titlePassageDescription": "Dallas, TX",
        "transportationTermsSource": "tradeTerms",
        "transportationTerms": "freeOnBoard",
        "riskOfLoss": "toDestinationBuyer"
      }
    ],
    "specialHandling": [
      {
        "handlingType": "fragile",
        "description": "Handle with care"
      },
      {
        "handlingType": "temperatureControl",
        "description": "Maintain temperature between 60-70°F"
      }
    ]
  },
  "allowances": [
    {
      "type": "volume",
      "amount": "500.00",
      "percent": "5.0",
      "percentBasis": "basePrice",
      "methodOfHandling": "paidByVendor",
      "description": "Volume discount for orders over $10,000"
    }
  ],
  "charges": [
    {
      "type": "freight",
      "amount": "250.00",
      "methodOfHandling": "prepaid",
      "description": "Prepaid freight charges"
    }
  ],
  "monetaryAmounts": {
    "gross": "10500.00",
    "net": "10000.00"
  },
  "taxes": {
    "stateProvincialTax": {
      "amount": "650.00",
      "percent": "6.5",
      "jurisdictionType": "state",
      "jurisdictionCode": "IL"
    },
    "localTax": {
      "amount": "100.00",
      "percent": "1.0",
      "jurisdictionType": "local",
      "jurisdictionCode": "CHI"
    }
  },
  "lineItems": [
    {
      "purchaseOrderLineId": "1",
      "quantity": {
        "value": "100",
        "unitOfMeasure": "each"
      },
      "unitCostPrice": "45.00",
      "unitPriceBasis": "perEach",
      "additionalPricing": [
        {
          "priceType": "promotional",
          "unitPrice": "42.00",
          "unitPriceBasis": "perEach",
          "quantityPerUnitPrice": "1"
        }
      ],
      "productIds": {
        "buyerItemNumber": "ACME-12345",
        "vendorItemNumber": "GSI-78901",
        "gtin13": "1234567890123",
        "buyerItemIds": [
          {
            "type": "sku",
            "value": "SKU-ACME-12345"
          }
        ]
      },
      "productAttributes": {
        "description": "Premium Widget - Blue",
        "colorCode": "BLU",
        "colorDescription": "Blue",
        "sizeCode": "LG",
        "sizeDescription": "Large",
        "materialCode": "STEEL",
        "materialDescription": "Stainless Steel"
      },
      "outerPack": {
        "numberOfUnits": "10",
        "size": "12",
        "sizeUOM": "each",
        "packageForm": "box",
        "packageMaterial": "corrugated",
        "weightUOM": "pound",
        "grossWeight": "50",
        "netWeight": "45",
        "dimensionUOM": "inch",
        "length": "24",
        "width": "18",
        "height": "12",
        "packageId": "PKG-001"
      },
      "innerPack": {
        "numberOfUnits": "1",
        "size": "1",
        "sizeUOM": "each",
        "packageForm": "box",
        "packageMaterial": "corrugated",
        "weightUOM": "pound",
        "grossWeight": "5",
        "netWeight": "4.5"
      },
      "packaging": [
        {
          "characteristicType": "typeOfPackage",
          "description": "Corrugated cardboard box",
          "unitLoadOption": "palletized"
        }
      ],
      "dates": {
        "requestedShipDate": "2024-02-01",
        "requestedDeliveryDate": "2024-02-05",
        "earliestShipDate": "2024-01-28"
      },
      "references": {
        "departmentNumber": {
          "value": "DEPT-10",
          "description": "Department"
        },
        "storeNumber": {
          "value": "STORE-001",
          "description": "Store location"
        }
      },
      "destinationQuantities": {
        "locationType": "warehouse",
        "unitOfMeasure": "each",
        "quantityByLocation": [
          {
            "destinationId": "WH-001",
            "quantity": "60"
          },
          {
            "destinationId": "WH-002",
            "quantity": "40"
          }
        ]
      },
      "allowances": [
        {
          "type": "quantityDiscount",
          "amount": "50.00",
          "percent": "1.0",
          "methodOfHandling": "paidByVendor",
          "description": "Quantity discount for 100+ units"
        }
      ],
      "charges": [
        {
          "type": "handling",
          "amount": "25.00",
          "methodOfHandling": "prepaid",
          "description": "Special handling charge"
        }
      ],
      "monetaryAmounts": {
        "gross": "4500.00",
        "net": "4450.00"
      },
      "sublineItems": [
        {
          "sublineId": "1-1",
          "quantity": {
            "value": "50",
            "unitOfMeasure": "each"
          },
          "productIds": {
            "buyerItemNumber": "ACME-12345-A",
            "vendorItemNumber": "GSI-78901-A"
          },
          "unitCostPrice": "45.00",
          "unitPriceBasis": "perEach"
        }
      ],
      "notes": {
        "general": {
          "description": "Line item notes",
          "text": [
            "Ensure proper packaging",
            "Include installation instructions"
          ]
        },
        "shippingInstructions": {
          "description": "Shipping notes",
          "text": [
            "Ship in original packaging",
            "Do not stack more than 5 high"
          ]
        }
      },
      "paperwork": [
        {
          "reportType": "materialDataSheet",
          "copiesNeeded": 1,
          "description": "MSDS required for this item"
        }
      ],
      "conditionsAndRestrictions": [
        {
          "conditionType": "shipComplete",
          "action": "confirm"
        }
      ],
      "carrierDetails": {
        "routing": [
          {
            "sequenceType": "origin",
            "transportationMethod": "commonCarrier",
            "serviceLevel": "ground"
          }
        ],
        "freeOnBoard": [
          {
            "methodOfPayment": "prepaidBySeller",
            "locationType": "origin"
          }
        ]
      }
    },
    {
      "purchaseOrderLineId": "2",
      "quantity": {
        "value": "250",
        "unitOfMeasure": "case"
      },
      "unitCostPrice": "18.50",
      "unitPriceBasis": "perEach",
      "productIds": {
        "buyerItemNumber": "ACME-67890",
        "vendorItemNumber": "GSI-23456",
        "gtin14": "12345678901234"
      },
      "productAttributes": {
        "description": "Standard Widget - Red",
        "colorCode": "RED",
        "colorDescription": "Red",
        "sizeCode": "MD",
        "sizeDescription": "Medium"
      },
      "outerPack": {
        "numberOfUnits": "25",
        "size": "1",
        "sizeUOM": "case",
        "packageForm": "box",
        "packageMaterial": "corrugated",
        "weightUOM": "pound",
        "grossWeight": "30",
        "netWeight": "28"
      },
      "dates": {
        "requestedShipDate": "2024-02-01",
        "requestedDeliveryDate": "2024-02-05"
      },
      "monetaryAmounts": {
        "gross": "4625.00",
        "net": "4625.00"
      },
      "notes": {
        "general": {
          "description": "Standard item",
          "text": [
            "Standard packaging acceptable"
          ]
        }
      }
    },
    {
      "purchaseOrderLineId": "3",
      "quantity": {
        "value": "50",
        "unitOfMeasure": "each"
      },
      "unitCostPrice": "17.50",
      "productIds": {
        "buyerItemNumber": "ACME-11111",
        "vendorItemNumber": "GSI-33333",
        "gtin12": "123456789012"
      },
      "monetaryAmounts": {
        "gross": "875.00",
        "net": "875.00"
      }
    }
  ]
}

Process in Your System

  1. Parse the PO data
  2. Check inventory availability
  3. Validate pricing
  4. Create a sales order in your ERP/OMS

Confirm Receipt

After successful processing, acknowledge the delivery:

curl -X POST "https://api.orderful.com/v4/transactions/12345/deliveries/67890/approve" \
  -H "orderful-api-key: YOUR_API_KEY" \
  -H "orderful-version: v4"

Step 2: Send Purchase Order Acknowledgment (855)

The POA tells the retailer whether you can fulfill the order. Send it within the timeframe specified in your trading partner agreement (typically 24-48 hours).

Acknowledgment Scenarios

ScenarioCodeDescription
Full acceptanceAC + all lines IAAccept order as-is
Partial acceptanceAC + mixed codesSome items accepted, others modified
Changes madeAC + lines with ICAccepted with changes (qty, date, etc.)
RejectionRJEntire order rejected

Example: Full Acceptance

curl -X POST "https://api.orderful.com/v4/transactions" \
  -H "orderful-api-key: YOUR_API_KEY" \
  -H "orderful-version: v4" \
  -H "Content-Type: application/json" \
  -d '{
    "sender": { "isaId": "YOUR_ISA_ID" },
    "receiver": { "isaId": "RETAILCORP" },
    "stream": "live",
    "transactionType": "855",
    "relatedTransactionId": 12345,
    "message": {
      "purchaseOrderAcknowledgment": {
        "acknowledgmentType": "AC",
        "purchaseOrderNumber": "PO-2026-78901",
        "acknowledgedDate": "2026-01-15",
        "estimatedShipDate": "2026-01-25",
        "lineItems": [
          {
            "lineNumber": "001",
            "acknowledgmentCode": "IA",
            "vendorPartNumber": "WIDGET-A",
            "acknowledgedQuantity": 500,
            "unitPrice": 12.50
          },
          {
            "lineNumber": "002",
            "acknowledgmentCode": "IA",
            "vendorPartNumber": "WIDGET-B",
            "acknowledgedQuantity": 300,
            "unitPrice": 12.50
          }
        ]
      }
    }
  }'

Example: Partial Acceptance (Backorder)

{
  "message": {
    "purchaseOrderAcknowledgment": {
      "acknowledgmentType": "AC",
      "purchaseOrderNumber": "PO-2026-78901",
      "lineItems": [
        {
          "lineNumber": "001",
          "acknowledgmentCode": "IA",
          "acknowledgedQuantity": 500
        },
        {
          "lineNumber": "002",
          "acknowledgmentCode": "IB",
          "acknowledgedQuantity": 200,
          "backorderQuantity": 100,
          "estimatedBackorderDate": "2026-02-15",
          "note": "100 units on backorder, shipping 200 now"
        }
      ]
    }
  }
}

Step 3: Send Advance Ship Notice (856)

When you ship the order, send an ASN with carton-level detail. This enables the retailer to receive goods efficiently.

ASN Structure

Shipment (856)
├── Shipment Header (carrier, dates, totals)
├── Order Reference (PO number)
└── Hierarchical Levels
    ├── Shipment Level (HL-S)
    │   └── Order Level (HL-O)
    │       └── Pack Level (HL-P) - Cartons/Pallets
    │           └── Item Level (HL-I) - Line items

Example: Complete ASN

curl -X POST "https://api.orderful.com/v4/transactions" \
  -H "orderful-api-key: YOUR_API_KEY" \
  -H "orderful-version: v4" \
  -H "Content-Type: application/json" \
  -d '{
    "sender": { "isaId": "YOUR_ISA_ID" },
    "receiver": { "isaId": "RETAILCORP" },
    "stream": "live",
    "transactionType": "856",
    "relatedTransactionId": 12345,
    "message": {
      "shipNotice": {
        "shipmentIdentifier": "SHIP-2026-001234",
        "shipDate": "2026-01-25",
        "estimatedDeliveryDate": "2026-01-28",
        "shipmentWeight": 125.5,
        "weightUnit": "LB",
        "carrier": {
          "name": "FastFreight Logistics",
          "scac": "FFRL",
          "serviceLevel": "GROUND",
          "proNumber": "PRO123456789",
          "trackingNumbers": ["1Z999AA10123456784"]
        },
        "shipFrom": {
          "name": "Your Company Warehouse",
          "address": {
            "street": "100 Industrial Way",
            "city": "Manufacturing City",
            "state": "TX",
            "postalCode": "75001"
          }
        },
        "shipTo": {
          "locationCode": "DC-005",
          "name": "Retail Corp DC #5",
          "address": {
            "street": "456 Warehouse Blvd",
            "city": "Commerce City",
            "state": "CA",
            "postalCode": "90211"
          }
        },
        "purchaseOrderNumber": "PO-2026-78901",
        "packages": [
          {
            "packageType": "CTN",
            "packageId": "SSCC00123456789012345671",
            "weight": 65.5,
            "weightUnit": "LB",
            "contents": [
              {
                "lineNumber": "001",
                "vendorPartNumber": "WIDGET-A",
                "upc": "012345678901",
                "quantity": 500
              }
            ]
          },
          {
            "packageType": "CTN",
            "packageId": "SSCC00123456789012345672",
            "weight": 60.0,
            "weightUnit": "LB",
            "contents": [
              {
                "lineNumber": "002",
                "vendorPartNumber": "WIDGET-B",
                "upc": "012345678902",
                "quantity": 300
              }
            ]
          }
        ]
      }
    }
  }'

GS1-128 Labels

Most retailers require GS1-128 (UCC-128) labels on each carton. The SSCC (Serial Shipping Container Code) in the ASN must match the barcode on the physical carton.


Step 4: Send Invoice (810)

After shipment, send the invoice. Many retailers have strict timing requirements (e.g., invoice within 48 hours of ship date).

Example: Complete Invoice

curl -X POST "https://api.orderful.com/v4/transactions" \
  -H "orderful-api-key: YOUR_API_KEY" \
  -H "orderful-version: v4" \
  -H "Content-Type: application/json" \
  -d '{
    "sender": { "isaId": "YOUR_ISA_ID" },
    "receiver": { "isaId": "RETAILCORP" },
    "stream": "live",
    "transactionType": "810",
    "relatedTransactionId": 12345,
    "message": {
      "invoice": {
        "invoiceNumber": "INV-2026-001234",
        "invoiceDate": "2026-01-25",
        "invoiceType": "original",
        "purchaseOrderNumber": "PO-2026-78901",
        "shipDate": "2026-01-25",
        "paymentTerms": {
          "termsType": "NET",
          "netDays": 30,
          "discountPercent": 2,
          "discountDays": 10,
          "description": "2% 10 Net 30"
        },
        "remitTo": {
          "name": "Your Company Inc",
          "address": {
            "street": "100 Corporate Drive",
            "city": "Business City",
            "state": "CA",
            "postalCode": "90001"
          }
        },
        "lineItems": [
          {
            "lineNumber": "001",
            "vendorPartNumber": "WIDGET-A",
            "upc": "012345678901",
            "description": "Premium Widget - Blue",
            "quantity": 500,
            "unitOfMeasure": "EA",
            "unitPrice": 12.50,
            "lineTotal": 6250.00
          },
          {
            "lineNumber": "002",
            "vendorPartNumber": "WIDGET-B",
            "upc": "012345678902",
            "description": "Premium Widget - Red",
            "quantity": 300,
            "unitOfMeasure": "EA",
            "unitPrice": 12.50,
            "lineTotal": 3750.00
          }
        ],
        "summary": {
          "totalLineItems": 2,
          "totalQuantity": 800,
          "subtotal": 10000.00,
          "freightAmount": 150.00,
          "taxAmount": 0.00,
          "totalAmount": 10150.00
        }
      }
    }
  }'

Handling Exceptions

Scenario: Partial Shipment

If you can't ship everything at once:

  1. 855 POA: Indicate partial acceptance or backorder
  2. 856 ASN: Send for items being shipped now
  3. 810 Invoice: Invoice only for shipped items
  4. Repeat 3-4: Send additional ASN/Invoice when backorder ships

Scenario: Order Changes

If the retailer sends an order change (860):

  1. Receive and process the 860
  2. Send an 865 (PO Change Acknowledgment)
  3. Adjust your fulfillment accordingly

Scenario: Returns

For return authorizations, implement the 180/944 or 180/812 flow as required by your trading partner.


Timeline Best Practices

EventRecommended Timing
855 POAWithin 24 hours of receiving 850
856 ASNSame day as shipment (before goods arrive)
810 InvoiceWithin 48 hours of shipment
⚠️

Note: Timing requirements vary by trading partner. Check your specific partner's guidelines.


Monitoring Your Integration

Check Transaction Status

curl -X GET "https://api.orderful.com/v3/transactions/12345" \
  -H "orderful-api-key: YOUR_API_KEY"

View in Orderful Portal

Monitor your transactions in real-time:

  1. Go to Transactions in the Orderful portal
  2. Filter by transaction type, date, or status
  3. Click any transaction to see full details
Transactions Dashboard

Next Steps

  • Testing Guide - Test your O2C flow end-to-end
  • Webhook Configuration - Set up real-time notifications
  • Error Handling - Handle edge cases gracefully
  • Going Live Checklist - Production readiness checklist