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Hi @Guillaume GAYOT you can’t use

urlPathMatching

with a query string as you’ve attempted here. Since you’re not using a regex in the URL I suggest changing this to

urlPathEqualTo("/loyalty-accounts")

and add

.withQueryParam("employeeUid", equalTo("20010987"))

to the chain.

Thanks ! But I'm still stuck on the same issue : the call return an error "invalid client credentials" from the oauth provider.

Ah, great news! Glad you managed to figure it out.