There are two web services that are used when replicating data with actions or counters, GetActionsFromRmtDBV2 and GetReplCntrFromRemoteDB.
To use the web services, the remote location needs to publish the web services and the source location needs to subscribe to them. "Distribution Location" in Retail Setup defines if replication counters or actions are retrieved with web services.
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GetActionsFromRmtDBV2 – This web service is used to get actions from the remote location. Preactions are created when data is updated, and this web service returns those preactions so that it will only replicate the updated data.
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GetReplCntrFromRemoteDB – This web service is used to get the replication counter from the remote location for the table that is being replicated. The counter represents a specific line in the table from when the data were last replicated and the job replicates all the data that were added since then.