public String getDefaultSubstitutions() {
        return this.defaultSubstitutions;
    }
<p>
A JSON object that specifies the default values that are used for message variables in the version of the message
template. This object is a set of key-value pairs. Each key defines a message variable in the template. The
corresponding value defines the default value for that variable.
</p>

@return A JSON object that specifies the default values that are used for message variables in the version of the
        message template. This object is a set of key-value pairs. Each key defines a message variable in the
        template. The corresponding value defines the default value for that variable.
aws-java-sdk-pinpoint/src/main/java/com/amazonaws/services/pinpoint/model/TemplateVersionResponse.java