HTTP Requests and Responses

HTTP GET

Retrieving individual resources

To retrieve a specific resource you can append its identifier to the end of the URL. The example below shows retrieving a specific contact using the HTTP GET method. 

https://api.xero.com/api.xro/2.0/Contacts/fe61ead1-8afc-4f0b-beda-066620227aad
  • Successful responses return with a HTTP 200 status code
  • By default all successful API responses are returned as XML.
  • Individual Invoices and Credit Notes can also be returned in PDF format by setting the “Accept” value in the http header to “application/pdf”.
  • Some documents may have attachments. You can retrieve these via the API too. Learn More

JSON responses and date formats

JSON formatted responses are also supported by setting the “Accept” value in the http header to “application/json” when making a request.

At Xero we use .NET, and used the Microsoft .NET JSON date format available at the time of original development. We know it's ugly but not something we can fix without a breaking change or a new version of the API. We're really sorry about this. To help you along, below we explain how to handle this date format. An example date/time in JSON is returned like this:

"DateTimeUTC": "\/Date(1439434356790)\/" or "PeriodLockDate": "\/Date(1419937200000+0000)\/"
In both cases, the date/time value is a unix timestamp value, but in miliseconds rather than seconds (so divide by 1,000 for seconds). For some elements we also include a date string value on JSON responses to help with reading date values. e.g. DateString, DueDateString.

All resources

With some endpoints you may need to retrieve a full list of resources e.g. TaxRates or BrandingThemes. You can do this by simply using a HTTP GET with the resource name. 
https://api.xero.com/api.xro/2.0/TaxRates
We recommend all calls to any endpoints that have large result sets use the if-modified-since parameter.

Retrieving modified resources

The easiest way to retrieve resources that have been created or modified since a previous request is to specify a UTC timestamp filter using the If-Modified-Since http parameter. Only items created or updated since the specified timestamp will be returned (accurate to the second).

Please note: Not all changes will trigger a change of the UpdatedDateUTC field. These include changes to partially paid transactions which don't generate a journal such as DueDate or SentToContact, and Contact fields pulled from other sources such as Balances, IsSupplier, and isCustomer. As a result, transactions with these changes may not be returned with an If-Modified-Since query.

Retrieving paged resources

Paged results are available on the Invoices, Contacts, CreditNotes, BankTransactions, ManualJournals, PurchaseOrders, Prepayments and Overpayments endpoints. Paged results will have extra detail (e.g. line items) and may mean you don't have to retrieve individual resources to get the information you need. To utilise paging you must append a page parameter to the URL e.g. ?page=1. If there are 100 records in the response you will need to check if there is any more data by fetching the next page e.g ?page=2 and continuing this process until no more results are returned. It is not possible to specify the page size.

Retrieving a filtered set of resources

Our busiest endpoints (Invoices and Contacts ) have explicit query parameters for commonly used filters. These parameters allow you to pass a comma-separated list of values in a single request. For faster response times we recommend using these where available.


Example 1 : Retrieve all Invoices for a specific set of Contacts 
GET https://.../Invoices?ContactIDs=3138017f-8ddc-420e-a159-e7e1cf9e643d,4b2df4a1-7aa5-4ce3-9e9c-3c55794c5283
Example 2 : Retrieve all unpaid Invoices against a particular Contact 
GET https://.../Invoices?ContactIDs=3138017f-8ddc-420e-a159-e7e1cf9e643d&Statuses=AUTHORISED
Example 3 : Retrieve all DELETED or VOIDED Invoices 
GET https://.../Invoices?Statuses=DELETED,VOIDED

Retrieving a filtered set of resources using the “where” parameter

The where parameter allows you to filter on endpoints and elements that don't have explicit parameters.

  • it can reference most elements on the resource.
  • it must be encoded using percent encoding before it is appended to the URL.

Please note: even though the where filter supports complex queries we recommend you keep them as simple as possible. Long, complex where queries can cause time outs. To ensure your calls run efficiently against larger organisations it's a good idea to restrict your queries to simple == operations.

Example 1 : Retrieve all Bank Accounts using the Accounts endpoint 

Type=="BANK"
This would translate to the following URL once percent encoded. 
https://api.xero.com/api.xro/2.0/Accounts?where=Type%3D%3D%22BANK%22
Example 2: Retrieve all contacts with specific text in the contact name using the Contacts endpoint 
Name.Contains("Peter")
Name.StartsWith("P")
Name.EndsWith("r")
Example 3: For optional elements such as email address, it is best that you add a not null at the starts of the query. If you don’t include it you will get an exception if any of the optional elements aren’t set. This example is using the Contacts endpoint 
EmailAddress!=null&&EmailAddress.StartsWith("boom")
Example 4: Retrieve invoices with an invoice date between a date range 
Date >= DateTime(2015, 01, 01) && Date < DateTime(2015, 12, 31)

Ordering of results

A list of items can be returned in a specific order. To specify the ordering, append an order querystring to the endpoint URL.
Example : To order contacts by email address the following url could be used 
https://api.xero.com/api.xro/2.0/Contacts?order=EmailAddress
You can get results in descending order by using DESC parameter. 
https://api.xero.com/api.xro/2.0/Contacts?order=EmailAddress%20DESC

HTTP POST and PUT

Creating resources

The HTTP PUT and POST methods are used for sending information to the API.
  • A PUT method will create new data in Xero, whereas a POST will either create new data or update existing data in Xero.
  • The Content-Type should be set as “application/x-www-form-urlencoded”
  • The Encoding type should be set as “UTF-8”
  • Only XML formatted requests are accepted. The XML must be sent in an html form parameter called “xml”.
You should check the response from each API call and not assume that it will be completed successfully. This includes
  • checking that you get a HTTP 200 response and a status of OK. Learn more
  • checking that you have received an identifier (e.g. InvoiceID) for the new object created.

Creating many resources

It is possible to submit more than one invoice, credit note, contact, item or other entities of the same type in a single API call. If you plan to submit more than one entity per API call, we recommend that you append the summarizeErrors=false querystring to your API call. This ensures that every entity is returned back to you, each having their own status attribute. 
POST /api.xro/2.0/Invoices?summarizeErrors=false
Note: The summarizeErrors option is only available for the Accounting API. The summarizeErrors option will not affect AU or US Payroll API calls.

The following xml is a sample response of a bulk upload to the Invoices endpoint.
  • A status attribute is included for each Invoice can be OK, WARNING or ERROR.
  • If you have a validation error in any of your objects you will receive a HTTP 200 status code (rather than HTTP 400) if you are using the summarizeErrors parameter
<Invoices>
    <Invoice status="OK">
      ...
    </Invoice>
    <Invoice status="OK">
      ...
    </Invoice>
    <Invoice status="WARNING">
      ...
    </Invoice>
    <Invoice status="ERROR">
      ...
    </Invoice>
  </Invoices>
</Response>
  • A WARNING status indicated that the entity was successfully processed, but there are additional warnings added to the response.
  • An ERROR status indicates that the entity could not be saved to Xero due to a validation error.

Updating resources

When using POST to update an invoice or contact, you can specify the id of the object being updated in the url: e.g 
https://api.xero.com/api.xro/2.0/Invoices/INV-000394

Debugging requests and responses

If you receive a HTTP 400 response this is due to a validation error. The response will include an "APIException" element that contains a useful summary of the reason for the validation error. Learn more