diff --git a/client/types/types.go b/client/types/types.go
index 22a3763..9f66b5c 100644
--- a/client/types/types.go
+++ b/client/types/types.go
@@ -9,8 +9,6 @@ type AddVoiceResponse struct {
 	VoiceID string `json:"voice_id"`
 }
 
-type AnyOfValidationErrorLocItems struct{}
-
 type HistoryPost struct {
 	HistoryItemIds []string `json:"history_item_ids"`
 }
@@ -25,11 +23,6 @@ type TTS struct {
 	VoiceSettings SynthesisOptions `json:"voice_settings,omitempty"` // Voice settings are applied only on the given TTS request.
 }
 
-var DefaultSynthesisOptions = SynthesisOptions{
-	Stability:       75,
-	SimilarityBoost: 75,
-}
-
 type SynthesisOptions struct {
 	Stability       float64 `json:"stability"`
 	SimilarityBoost float64 `json:"similarity_boost"`
@@ -51,7 +44,7 @@ type ExtendedSubscriptionResponseModel struct {
 	CanUseDelayedPaymentMethods    bool                    `json:"can_use_delayed_payment_methods"`
 	Currency                       string                  `json:"currency"`
 	Status                         string                  `json:"status"`
-	NextInvoice                    InvoiceResponseModel    `json:"next_invoice"`
+	NextInvoice                    Invoice                 `json:"next_invoice"`
 }
 type FeedbackResponseModel struct {
 	ThumbsUp        bool   `json:"thumbs_up"`
@@ -93,9 +86,6 @@ type HistoryItemList struct {
 	Settings                 *interface{}           `json:"settings"`
 	Feedback                 *FeedbackResponseModel `json:"feedback"`
 }
-type HttpValidationError struct {
-	Detail []ValidationError `json:"detail,omitempty"`
-}
 type Invoice struct {
 	AmountDueCents         int32 `json:"amount_due_cents"`
 	NextPaymentAttemptUnix int32 `json:"next_payment_attempt_unix"`
@@ -147,9 +137,9 @@ type UserResponseModel struct {
 	XiAPIKey     string       `json:"xi_api_key"`
 }
 type ValidationError struct {
-	Loc   []AnyOfValidationErrorLocItems `json:"loc"`
-	Msg   string                         `json:"msg"`
-	Type_ string                         `json:"type"`
+	Loc   any    `json:"loc"`
+	Msg   string `json:"msg"`
+	Type_ string `json:"type"`
 }
 
 func (ve ValidationError) Error() string {
diff --git a/client/voices.go b/client/voices.go
index f362802..cf7e553 100644
--- a/client/voices.go
+++ b/client/voices.go
@@ -2,47 +2,244 @@ package client
 
 import (
 	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
 	"net/http"
 	"os"
 	"strings"
+
+	"github.com/taigrr/elevenlabs/client/types"
 )
 
-func (c Client) CreateVoice(ctx context.Context, name string, files []*os.File, description string, labels string) (AddVoiceResponseModel, *http.Response, error) {
+func (c Client) CreateVoice(ctx context.Context, name string, files []*os.File, description string, labels string) error {
 	localVarHttpMethod = strings.ToUpper("Post")
 	localVarPath := a.client.cfg.BasePath + "/v1/voices/add"
 }
 
-func (c Client) DeleteVoice(ctx context.Context, voiceId string) (Object, *http.Response, error) {
-	localVarHttpMethod = strings.ToUpper("Delete")
-	localVarPath := a.client.cfg.BasePath + "/v1/voices/{voice_id}"
+func (c Client) DeleteVoice(ctx context.Context, voiceID string) error {
+	url := fmt.Sprintf(c.endpoint+"/v1/voices/%s", voiceID)
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return err
+	case 401:
+		return ErrUnauthorized
+	case 200:
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return errors.Join(err, ErrUnspecified)
+	}
 }
 
-func (c Client) EditVoiceSettings(ctx context.Context, body Settings, voiceId string) (Object, *http.Response, error) {
-	localVarHttpMethod = strings.ToUpper("Post")
-	localVarPath := a.client.cfg.BasePath + "/v1/voices/{voice_id}/settings/edit"
+func (c Client) EditVoiceSettings(ctx context.Context, voiceID string, types.SynthesisOptions) error {
+	url := fmt.Sprintf(c.endpoint+"/v1/voices/%s/settings/edit", voiceID)
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return err
+	case 401:
+		return ErrUnauthorized
+	case 200:
+		if err != nil {
+			return err
+		}
+		so := types.SynthesisOptions{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&so)
+		if jerr != nil {
+			return jerr
+		}
+		return nil
+	default:
+		return errors.Join(err, ErrUnspecified)
+	}
 }
 
-func (c Client) EditVoice(ctx context.Context, name string, files []*os.File, description string, labels string, voiceId string) (Object, *http.Response, error) {
+func (c Client) EditVoice(ctx context.Context, voiceID, name, description string,  files []*os.File, labels []string ) error {
 	localVarHttpMethod = strings.ToUpper("Post")
 	localVarPath := a.client.cfg.BasePath + "/v1/voices/{voice_id}/edit"
 }
 
-func (c Client) DefaultVoiceSettings(ctx context.Context) (VoiceSettingsResponseModel, *http.Response, error) {
-	localVarHttpMethod = strings.ToUpper("Get")
-	localVarPath := a.client.cfg.BasePath + "/v1/voices/settings/default"
+func (c Client) defaultVoiceSettings(ctx context.Context) (types.SynthesisOptions, error) {
+	url := c.endpoint + "/v1/voices/settings/default"
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return types.SynthesisOptions{}, err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return types.SynthesisOptions{}, err
+	case 401:
+		return types.SynthesisOptions{}, ErrUnauthorized
+	case 200:
+		if err != nil {
+			return types.SynthesisOptions{}, err
+		}
+		so := types.SynthesisOptions{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&so)
+		if jerr != nil {
+			return types.SynthesisOptions{}, jerr
+		}
+		return so, nil
+	default:
+		return types.SynthesisOptions{}, errors.Join(err, ErrUnspecified)
+	}
 }
 
 func (c Client) GetVoiceSettings(ctx context.Context, voiceId string) (VoiceSettingsResponseModel, *http.Response, error) {
 	localVarHttpMethod = strings.ToUpper("Get")
 	localVarPath := a.client.cfg.BasePath + "/v1/voices/{voice_id}/settings"
+	url := fmt.Sprintf(c.endpoint+"/v1/voices/%s", voiceID)
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return err
+	case 401:
+		return ErrUnauthorized
+	case 200:
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return errors.Join(err, ErrUnspecified)
+	}
 }
 
 func (c Client) GetVoice(ctx context.Context, voiceId string) (VoiceResponseModel, *http.Response, error) {
 	localVarHttpMethod = strings.ToUpper("Get")
 	localVarPath := a.client.cfg.BasePath + "/v1/voices/{voice_id}"
+	url := fmt.Sprintf(c.endpoint+"/v1/voices/%s", voiceID)
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return err
+	case 401:
+		return ErrUnauthorized
+	case 200:
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return errors.Join(err, ErrUnspecified)
+	}
 }
 
 func (c Client) GetVoices(ctx context.Context) (GetVoicesResponseModel, *http.Response, error) {
 	localVarHttpMethod = strings.ToUpper("Get")
 	localVarPath := a.client.cfg.BasePath + "/v1/voices"
+	url := fmt.Sprintf(c.endpoint+"/v1/voices/%s", voiceID)
+	client := &http.Client{}
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("xi-api-key", c.apiKey)
+	req.Header.Set("User-Agent", "github.com/taigrr/elevenlabs")
+	req.Header.Set("accept", "application/json")
+	res, err := client.Do(req)
+	switch res.StatusCode {
+	case 422:
+		ve := types.ValidationError{}
+		defer res.Body.Close()
+		jerr := json.NewDecoder(res.Body).Decode(&ve)
+		if jerr != nil {
+			err = errors.Join(err, jerr)
+		} else {
+			err = errors.Join(err, ve)
+		}
+		return err
+	case 401:
+		return ErrUnauthorized
+	case 200:
+		if err != nil {
+			return err
+		}
+		return nil
+	default:
+		return errors.Join(err, ErrUnspecified)
+	}
 }