@PUT("/v3/service_agreement_setups/{id}")
Single<Response<Agreement>> editAgreement(@Path("id") Integer id, @Body AgreementRequest agreementRequest);

@Expose @SerializedName("service_agreement_setup") private Agreement  agreement;

public AgreementRequest(Agreement agreement) {
this.agreement = agreement;
}

public Agreement getAgreement() {
return agreement;
}

public void setAgreement(Agreement agreement) {
this.agreement = agreement;
}
}