This guide assumes you have API access and the necessary permissions. For help enabling this feature, contact your Merchant Success Manager or support@loopreturns.com.

​
📝 Overview

Loop’s Grading & Disposition APIs allow merchants and partners to automate the process of grading returned items and recording their disposition (e.g., restock, refurbish, donate, dispose). This enables more efficient returns processing, inventory management, and reporting. The core requirement for making grading and disposition API calls is the line_item_id for the item being processed. You can obtain this from various sources, such as return webhooks, the detailed returns list, or the return details endpoint. For a broader introduction, see the Item Grading and Dispositioning help center article, but note this guide is focused on API integration.

​
⚙️ Prerequisites

Before integrating with the Grading & Disposition APIs, ensure you have:
  • Access to the Loop admin and API documentation.
  • An API key with the Return scope (generate one in Developer tools in Loop Admin)
  • The line_item_id for the item you wish to grade/dispose.

​
🔍 Step 1: Obtain the line_item_id

To make grading or disposition API calls, you need the line_item_id for the item. There are two main ways to obtain it:

​
Webhooks

The most common way to obtain the line_item_id is by listening to the Return webhook, which sends real-time events when a return is created or updated. The line_item_id will be included in the webhook payload. Example webhook payload: 
{
  "topic": "return",
  "trigger": "return.created",
  "id": "1673",
  "line_items": [
    {
      "line_item_id": 123456789,
      "sku": "new-sku",
      "title": "Retro Laser - Big"
      // ... other fields
    }
  ]
  // ... other fields
}

​
APIs

You can also obtain the line_item_id using Loop’s API:
  • Detailed Returns List
    Retrieve a list of returns, each with its associated line items.
  • Get Return Details
    Retrieve details for a specific return, including all line items and their IDs.
    You must have the return_id on hand to make this API call and include it as a path parameter.
Both endpoints return a line_items array, where each object contains the line_item_id: 
{
  "id": "1673",
  "line_items": [
    {
      "line_item_id": 123456789,
      "sku": "new-sku",
      "title": "Retro Laser - Big"
      // ... other fields
    }
  ]
  // ... other fields
}

​
🛠️ Step 2: Grade and Disposition an Item

Once you have the line_item_id, you must make two separate API requests: one to grade the item and another to set its disposition.

​
Grading an Item

Use the grading endpoint to record the item’s condition (e.g., new, like new, damaged).
Fields for Grading an Item
  • items (array, required): List of items to grade (max 20). Each item must include:
    • line_item_id (integer, required): The unique identifier for the return line item.
    • description (string, required): Description of the item’s condition (max 255 characters).
    • condition_category (string, optional): The condition code for the returned item.
      Possible values: grade_a, grade_b, grade_c, grade_d, incorrect_item, missing, junk
    • return_processor (string, optional): Email of the warehouse or partner processing the return (max 100 characters).
    • note (string, optional): Additional notes on the item’s condition (max 65535 characters).
    • images (array, optional): Up to 5 links (URIs) to images of the item.
    • inspected_at (string, optional): Date/time the item was inspected (ISO 8601 format).
Required fields:
  • items (array)
  • Each item: line_item_id, description
Tip: All other fields are optional but recommended for richer reporting and auditing.
Example items array in request body: 
{
  "items": [
    {
      "line_item_id": 1,
      "description": "Grade A: No refurbishment needed",
      "condition_category": "grade_a",
      "return_processor": "warehouse-operator@example.com",
      "note": "This item is missing the original packaging. Light refurbishment required. Scuff marks on the back of the item.",
      "images": ["https://example.com/image.jpg"],
      "inspected_at": "2024-03-31 23:59:59"
    }
  ]
}

​
Setting Disposition

Use the disposition endpoint to record what will happen to the item (e.g., restocked, donated, disposed).
Fields for Setting Disposition
  • items (array, required): List of items to disposition (max 20). Each item must include:
    • line_item_id (integer, required): The unique identifier for the return line item.
    • disposition_outcome (string, required): The final state of the returned item.
      Possible values: back_to_stock, resale_hold, recycle, donate, missing
    • return_processor (string, optional): Email of the warehouse or partner processing the return (max 100 characters).
    • note (string, optional): Additional notes on the item’s final state (max 65535 characters).
    • inspected_at (string, optional): Date/time the item was inspected (ISO 8601 format).
Required fields:
  • items (array)
  • Each item: line_item_id, disposition_outcome
Tip: All other fields are optional but recommended for richer reporting and auditing.
Example items array in request body: 
{
  "items": [
    {
      "line_item_id": 1,
      "disposition_outcome": "back_to_stock",
      "return_processor": "warehouse-operator@example.com",
      "note": "This item will be returned to stock after bagging and tagging.",
      "inspected_at": "2024-03-31 23:59:59"
    }
  ]
}
Consult the API documentation for all valid grade and disposition values.

​
🧪 Step 3: Testing, Validation, and Reporting

Before going live, thoroughly test your integration. Use sandbox or test environments if available. Validate that:
  • Grades and dispositions are recorded correctly in Loop.
  • All required data is present in your API calls.
  • Error handling is robust (e.g., invalid IDs, missing fields).

​
How to View Your Data

You can view grading and disposition data for a single return in the Loop Admin UI, or in aggregate via reporting. See the Viewing the data section of the Item Grading and Dispositioning help center article for step-by-step instructions.
How grading & disposition data appears in Loop Admin

How grading and disposition data appears in the Loop Admin UI

​
✅ Conclusion

Integrating with Loop’s Grading & Disposition APIs streamlines your returns process and improves inventory management.
Tip: You can also use grading and disposition data as a condition in your return workflows, allowing you to automate actions for future returns based on past grading/disposition outcomes. See the Workflows addition section of the Item Grading and Dispositioning help center article for more details.
If you have questions or need help, reach out to support@loopreturns.com.