The Salesforce Marketing Cloud utilizes multiple APIs that can all be utilized to perform various actions. These APIs use separate WSDLs and Endpoints than the Sales and Service Cloud APIs.
Let's get started with utilizing the most basic interface, SoapUI.
This sample request the 'Create' method, so you will need to have Triggered Sends setup within your Marketing Cloud account.
Note: In the SOAP UI:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://exacttarget.com/wsdl/partnerAPI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soap:Header>
<wsse:Security soap:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<wsse:UsernameToken>
<wsse:Username>USERNAME</wsse:Username>
<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">PASSWORD</wsse:Password>
</wsse:UsernameToken>
</wsse:Security>
</soap:Header>
<soap:Body>
<CreateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
<Options/>
<Objects xsi:type="TriggeredSend">
<PartnerKey xsi:nil="true"/>
<ObjectID xsi:nil="true"/>
<TriggeredSendDefinition>
<PartnerKey xsi:nil="true"/>
<ObjectID xsi:nil="true"/>
<CustomerKey>TRIGGERED SEND CUSTOMER KEY</CustomerKey>
</TriggeredSendDefinition>
<Subscribers>
<PartnerKey xsi:nil="true"/>
<ObjectID xsi:nil="true"/>
<EmailAddress>RECIPIENT EMAIL ADDRESS</EmailAddress>
<SubscriberKey>RECIPIENT SUBSCRIBER KEY</SubscriberKey>
<Attributes>
<Name>First Name</Name>
<Value>Michelangelo</Value>
</Attributes>
</Subscribers>
</Objects>
</CreateRequest>
</soap:Body>
</soap:Envelope>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"
xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"
xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
<soap:Header>
<wsa:Action>CreateResponse</wsa:Action>
<wsa:MessageID>urn:uuid:b1a01b6b-55fa-4515-84e4-ba4a05ff3385</wsa:MessageID>
<wsa:RelatesTo>urn:uuid:63a0cd4e-c30c-49eb-8bb5-df3abb16af37</wsa:RelatesTo>
<wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To>
<wsse:Security>
<wsu:Timestamp wsu:Id="Timestamp-2f5a6c0f-5df4-4326-8dc2-6a413595ba9f">
<wsu:Created>2015-12-29T15:12:23Z</wsu:Created>
<wsu:Expires>2015-12-29T15:17:23Z</wsu:Expires>
</wsu:Timestamp>
</wsse:Security>
</soap:Header>
<soap:Body>
<CreateResponse xmlns="http://exacttarget.com/wsdl/partnerAPI">
<Results xsi:type="TriggeredSendCreateResult">
<StatusCode>OK</StatusCode>
<StatusMessage>Created TriggeredSend</StatusMessage>
<OrdinalID>0</OrdinalID>
<NewID>0</NewID>
</Results>
<RequestID>a5fa33dc-43f6-4428-af30-9dc9811dfab0</RequestID>
<OverallStatus>OK</OverallStatus>
</CreateResponse>
</soap:Body>
</soap:Envelope>
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