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Append String Transformer Reference
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+ *Purpose:* Appends a string to a string payload.
Minimum Configuration: The string to append to the message payload.
Discussion: The Append String Transformer has the same advanced properties as all other transformers. Configuring these optional properties is covered in the [Studio Transformers] page.
You must specify the string that the transformer appends to the message payload. Click the General tab and place the string in the Message field.
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Use the Advanced tab to optionally configure the properties standard to all transformers.
Mule ESB Reference
For more information, see here.