Badi for ECC to CRM Customer replication track changes

Hi Experts,

We have a requirement to call external web service whenever erp customers(BP) are getting replicated to crm both in case of creation and updation scenario.

Any Badi which gets triggered in the above scenario which we can implement to track changes in bp or any other approach to implement this requirement.

Thanks in advance..

Cheers,

Sumit Mittal