diff --git a/authenticate.go b/authenticate.go
index 754823c..54be5a4 100644
--- a/authenticate.go
+++ b/authenticate.go
@@ -1,17 +1,61 @@
 package gophercloud
 
+import (
+	"github.com/racker/perigee"
+)
+
 type AuthOptions struct {
 	Username, Password, TenantId string
 }
 
-func (c *Context) Authenticate(provider string, options AuthOptions) (*int, error) {
-	_, err := c.ProviderByName(provider)
+type AuthContainer struct {
+	Auth Auth `json:"auth"`
+}
+
+type Auth struct {
+	PasswordCredentials PasswordCredentials `json:"passwordCredentials"`
+	TenantId string `json:"tenantId,omitempty"`
+}
+
+type PasswordCredentials struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+type ProviderAccess interface {
+	// ...
+}
+
+func (c *Context) Authenticate(provider string, options AuthOptions) (ProviderAccess, error) {
+	p, err := c.ProviderByName(provider)
 	if err != nil {
 		return nil, err
 	}
-
 	if (options.Username == "") || (options.Password == "") {
 		return nil, ErrCredentials
 	}
+
+	err = perigee.Post(p.AuthEndpoint, perigee.Options{
+		CustomClient: c.httpClient,
+		ReqBody:      &AuthContainer{
+			Auth: Auth{
+				PasswordCredentials: PasswordCredentials{
+					Username: options.Username,
+					Password: options.Password,
+				},
+				TenantId: options.TenantId,
+			},
+		},
+	})
 	return nil, nil
+
+	// if err != nil {
+	// 	return err
+	// }
+
+	// c.isAuthenticated = true
+	// c.token = id.access.Access.Token.Id
+	// c.expires = id.access.Access.Token.Expires
+	// c.tenantId = id.access.Access.Token.Tenant.Id
+	// c.tenantName = id.access.Access.Token.Tenant.Name
 }