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The URI format is the following: extcall:[keyType]:[targetURI] where keyType can be one of:
- message - to generate a key based on message source system and correlation ID, effectively providing duplicate call protection, but not obsolete call protection
- entity - to generate a key based on message objectId property, providing both duplicate call protection and obsolete call protection
- custom - to use a custom key provided in the ExtCallComponentParams.EXTERNAL_CALL_KEY exchange property
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