diff --git a/client/client.go b/client/client.go
index e824193..6eb7468 100644
--- a/client/client.go
+++ b/client/client.go
@@ -339,7 +339,7 @@ func (c *Client) printRequestDebugInfo(endpoint string, body []byte) {
 
 	fmt.Printf("\nGenerated cURL command:\n\n")
 	fmt.Printf("curl --location --insecure --request POST '%s' \\\n", endpoint)
-	fmt.Printf("  --header \"Authorization: Bearer ${OPENAI_API_KEY}\" \\\n")
+	fmt.Printf("  --header \"Authorization: Bearer ${%s_API_KEY}\" \\\n", strings.ToUpper(c.Config.Name))
 	fmt.Printf("  --header 'Content-Type: application/json' \\\n")
 	fmt.Printf("  --data-raw '%s'\n\n", bodyString)
 }
diff --git a/types/completions.go b/types/completions.go
index a56d2fb..2a14a57 100644
--- a/types/completions.go
+++ b/types/completions.go
@@ -1,12 +1,25 @@
 package types
 
+import "encoding/json"
+
+// Float64 is a custom type that wraps float64 and implements a custom YAML marshaller.
+type Float64 float64
+
+// MarshalJSON omits the field if the value is 0.0.
+func (f Float64) MarshalJSON() ([]byte, error) {
+	if f == 0.0 {
+		return []byte("null"), nil // Returning null to omit the field
+	}
+	return json.Marshal(float64(f))
+}
+
 type CompletionsRequest struct {
 	Model            string    `json:"model"`
 	Temperature      float64   `json:"temperature"`
 	TopP             float64   `json:"top_p"`
-	FrequencyPenalty float64   `json:"frequency_penalty"`
+	FrequencyPenalty float64   `json:"frequency_penalty,omitempty"`
 	MaxTokens        int       `json:"max_tokens"`
-	PresencePenalty  float64   `json:"presence_penalty"`
+	PresencePenalty  float64   `json:"presence_penalty,omitempty"`
 	Messages         []Message `json:"messages"`
 	Stream           bool      `json:"stream"`
 }