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The difference between a global extension and a per-API extension is simply in the name given to the sequence that you use to create it.
Creating global extensions
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Given below is the naming pattern of the sequence to follow when creating a global extension sequence.
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To test the code, copy it to an XML file (e.g., global_ext.xml) and save the file in the <APIM_HOME>/repository/deployment/server/synapse-configs/default/sequences directory. The above sequence prints a log message on the console on every API invocation.
Creating per-API extensions
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Given below is the naming pattern to follow when creating a per-API extension sequence.
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The above sequence prints a log message on the console whenever the TwitterSearch API is invoked.
Invoking the extension sequences
When an API is published, a file with its synapse configuration gets created on the API Gateway. If you inspect the synapse configuration of an API, you will see a set of handlers as shown in the following example:
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