Problem trying to create blank order

[swyse5]

When making the following API call:

POST https://fm260.infusionsoft.com/api/xmlrpc

Authorization: Bearer <access_token>
Content-Type: application/xml

<methodCall>
  <methodName>InvoiceService.createBlankOrder</methodName>
  <params>
    <param>
      <value><int>22</int></value>
    </param>
    <param>
      <value><string>hello world</string></value>
    </param>
    <param>
      <value><dateTime.iso8601>20080908T00:00:00</dateTime.iso8601></value>
    </param>
    <param>
      <value><int>2</int></value>
    </param>
    <param>
      <value><int>2</int></value>
    </param>
  </params>
</methodCall>

I always receive the following error:

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
    <fault>
        <value>
            <struct>
                <member>
                    <name>faultCode</name>
                    <value>
                        <i4>0</i4>
                    </value>
                </member>
                <member>
                    <name>faultString</name>
                    <value>No method matching arguments: java.lang.Integer, java.lang.String, java.util.Date, java.lang.Integer</value>
                </member>
            </struct>
        </value>
    </fault>
</methodResponse>

I see I'm not the first to receive an error like this, however I have copy and pasted this request from your API documentation and I can't seem to figure out what I have wrong. My HTTP client is just POSTMAN, as I just wanted to get a request working before I start writing code. Any help would be much appreciated!

[mfairch]

You are missing the API key. Replace "privateKey" with the api key found on the follow page: https://fm260.infusionsoft.com/app/miscSetting/itemWrapper?systemId=nav.admin&settingModuleName=Application&settingTabName=Application

<?xml version='1.0' encoding='UTF-8'?>
<methodCall>
  <methodName>InvoiceService.createBlankOrder</methodName>
  <params>
    <param>
      <value><string>privateKey</string></value>
    </param>
    <param>
      <value><int>22</int></value>
    </param>
    <param>
      <value><string>hello world</string></value>
    </param>
    <param>
      <value><dateTime.iso8601>20080908T00:00:00</dateTime.iso8601></value>
    </param>
    <param>
      <value><int>2</int></value>
    </param>
    <param>
      <value><int>2</int></value>
    </param>
  </params>
</methodCall>

[swyse5]

That worked, thank you. But I don't want to have to use the API key for every call. Is it possible to use the OAuth flow instead? I tried sending the access_token on the calls, like your docs say, but I got an 'Invalid key' error.