diff --git a/bindings/cmix.go b/bindings/cmix.go
index 2003f7c2fa876a091325fdd5b1f04a3bc710de98..bed5669b14e912f635aed5e494975661e05ef2f1 100644
--- a/bindings/cmix.go
+++ b/bindings/cmix.go
@@ -2,6 +2,7 @@ package bindings
 
 import (
 	"fmt"
+
 	"github.com/pkg/errors"
 	jww "github.com/spf13/jwalterweatherman"
 	"gitlab.com/elixxir/client/xxdk"
@@ -50,7 +51,7 @@ func NewKeystore(network, storageDir string, password []byte, regCode string) er
 // starts subprocesses to perform network operations.
 // TODO: add in custom parameters instead of the default
 func Login(storageDir string, password []byte) (*Cmix, error) {
-	client, err := xxdk.LoadCmix(storageDir, password, xxdk.GetDefaultParams())
+	client, err := xxdk.LoadCmix(storageDir, password, xxdk.GetDefaultCMixParams())
 	if err != nil {
 		return nil, errors.New(fmt.Sprintf("Failed to login: %+v", err))
 	}
diff --git a/bindings/e2e.go b/bindings/e2e.go
index 289de4218cad4a4fd485b3524826e0f702e05f3c..55ee801ad44d087a07ad95fa4112389bb7c5ebd5 100644
--- a/bindings/e2e.go
+++ b/bindings/e2e.go
@@ -8,6 +8,7 @@ package bindings
 
 import (
 	"encoding/json"
+
 	"gitlab.com/elixxir/client/auth"
 	"gitlab.com/elixxir/client/cmix/identity/receptionID"
 	"gitlab.com/elixxir/client/cmix/rounds"
@@ -51,12 +52,7 @@ func LoginE2e(cmixId int, callbacks AuthCallbacks, identity []byte) (*E2e, error
 		return nil, err
 	}
 
-	var authCallbacks auth.Callbacks
-	if callbacks == nil {
-		authCallbacks = auth.DefaultAuthCallbacks{}
-	} else {
-		authCallbacks = &authCallback{bindingsCbs: callbacks}
-	}
+	authCallbacks := &authCallback{bindingsCbs: callbacks}
 
 	newE2e, err := xxdk.Login(cmix.api, authCallbacks, newIdentity)
 	if err != nil {
@@ -79,12 +75,7 @@ func LoginE2eEphemeral(cmixId int, callbacks AuthCallbacks, identity []byte) (*E
 		return nil, err
 	}
 
-	var authCallbacks auth.Callbacks
-	if callbacks == nil {
-		authCallbacks = auth.DefaultAuthCallbacks{}
-	} else {
-		authCallbacks = &authCallback{bindingsCbs: callbacks}
-	}
+	authCallbacks := &authCallback{bindingsCbs: callbacks}
 
 	newE2e, err := xxdk.LoginEphemeral(cmix.api, authCallbacks, newIdentity)
 	if err != nil {
@@ -104,12 +95,7 @@ func LoginE2eLegacy(cmixId int, callbacks AuthCallbacks) (*E2e, error) {
 		return nil, err
 	}
 
-	var authCallbacks auth.Callbacks
-	if callbacks == nil {
-		authCallbacks = auth.DefaultAuthCallbacks{}
-	} else {
-		authCallbacks = &authCallback{bindingsCbs: callbacks}
-	}
+	authCallbacks := &authCallback{bindingsCbs: callbacks}
 
 	newE2e, err := xxdk.LoginLegacy(cmix.api, authCallbacks)
 	if err != nil {
@@ -181,18 +167,38 @@ func convertAuthCallbacks(requestor contact.Contact,
 
 // Confirm will be called when an auth Confirm message is processed.
 func (a *authCallback) Confirm(requestor contact.Contact,
-	receptionID receptionID.EphemeralIdentity, round rounds.Round) {
-	a.bindingsCbs.Confirm(convertAuthCallbacks(requestor, receptionID, round))
+	receptionID receptionID.EphemeralIdentity, round rounds.Round,
+	e2e *xxdk.E2e) {
+	if a.bindingsCbs == nil {
+		auth.DefaultAuthCallbacks{}.Confirm(requestor, receptionID,
+			round)
+		return
+	}
+	a.bindingsCbs.Confirm(convertAuthCallbacks(requestor, receptionID,
+		round))
 }
 
 // Request will be called when an auth Request message is processed.
 func (a *authCallback) Request(requestor contact.Contact,
-	receptionID receptionID.EphemeralIdentity, round rounds.Round) {
-	a.bindingsCbs.Request(convertAuthCallbacks(requestor, receptionID, round))
+	receptionID receptionID.EphemeralIdentity, round rounds.Round,
+	e2e *xxdk.E2e) {
+	if a.bindingsCbs == nil {
+		auth.DefaultAuthCallbacks{}.Request(requestor, receptionID,
+			round)
+		return
+	}
+	a.bindingsCbs.Request(convertAuthCallbacks(requestor, receptionID,
+		round))
 }
 
 // Reset will be called when an auth Reset operation occurs.
 func (a *authCallback) Reset(requestor contact.Contact,
-	receptionID receptionID.EphemeralIdentity, round rounds.Round) {
+	receptionID receptionID.EphemeralIdentity, round rounds.Round,
+	e2e *xxdk.E2e) {
+	if a.bindingsCbs == nil {
+		auth.DefaultAuthCallbacks{}.Reset(requestor, receptionID,
+			round)
+		return
+	}
 	a.bindingsCbs.Reset(convertAuthCallbacks(requestor, receptionID, round))
 }
diff --git a/bindings/e2eAuth.go b/bindings/e2eAuth.go
index b483671d90d3deb616bc0bd2e13018882e859ec1..fb21ad2d0f7de4345479b0681e6c56ee2d641598 100644
--- a/bindings/e2eAuth.go
+++ b/bindings/e2eAuth.go
@@ -8,6 +8,7 @@
 package bindings
 
 import (
+	"gitlab.com/elixxir/client/xxdk"
 	"gitlab.com/elixxir/crypto/contact"
 	"gitlab.com/elixxir/primitives/fact"
 	"gitlab.com/xx_network/primitives/id"
@@ -215,7 +216,9 @@ func (e *E2e) AddPartnerCallback(partnerID []byte, cb AuthCallbacks) error {
 		return err
 	}
 
-	e.api.GetAuth().AddPartnerCallback(partnerId, &authCallback{bindingsCbs: cb})
+	acw := xxdk.MakeAuthCB(e.api, &authCallback{bindingsCbs: cb})
+
+	e.api.GetAuth().AddPartnerCallback(partnerId, acw)
 	return nil
 }