diff --git a/README.md b/README.md
index 7b60311..85a57a6 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,14 @@ export NVOIP_TARGET_NUMBER="11999999999"
 - `python3 examples/list_whatsapp_templates.py`
 - `python3 examples/send_whatsapp_template.py`
 
+### Destinatário WhatsApp
+
+O exemplo mantém `NVOIP_WA_DESTINATION` para telefone. Para o contrato tipado,
+use `NVOIP_WA_RECIPIENT_TYPE=phone|bsuid|parent_bsuid` e
+`NVOIP_WA_RECIPIENT_VALUE`, sem `destination`. BSUID é opaco; não use
+`@username` nem o coloque em campo de telefone. Exemplos mascarados:
+`US.MASKED_BSUID_001` e `PARENT.MASKED_BSUID_001`.
+
 ## SDK web
 
 Para o fluxo de popup com telefone e codigo, use o repositório `nvoip-web-sdk`. Este repo cobre o consumo server-side da API.
diff --git a/examples/send_whatsapp_template.py b/examples/send_whatsapp_template.py
index 8a7a2ce..a9ff817 100644
--- a/examples/send_whatsapp_template.py
+++ b/examples/send_whatsapp_template.py
@@ -1,5 +1,6 @@
 import json
 import os
+import re
 
 from nvoip import NvoipClient
 
@@ -16,11 +17,28 @@
 
 payload = {
     "idTemplate": os.environ["NVOIP_WA_TEMPLATE_ID"],
-    "destination": os.getenv("NVOIP_WA_DESTINATION", os.getenv("NVOIP_TARGET_NUMBER", "11999999999")),
     "instance": os.environ["NVOIP_WA_INSTANCE"],
     "language": os.getenv("NVOIP_WA_LANGUAGE", "pt_BR"),
 }
 
+recipient_type = os.getenv("NVOIP_WA_RECIPIENT_TYPE", "").strip().lower()
+recipient_value = os.getenv("NVOIP_WA_RECIPIENT_VALUE", "").strip()
+if recipient_type:
+    if recipient_type not in {"phone", "bsuid", "parent_bsuid"} or not recipient_value:
+        raise ValueError("NVOIP_WA_RECIPIENT_TYPE must be phone, bsuid or parent_bsuid and requires NVOIP_WA_RECIPIENT_VALUE")
+    if recipient_value.startswith("@"):
+        raise ValueError("@username is not a WhatsApp recipient; use a BSUID or parent BSUID")
+    if recipient_type == "phone" and not re.fullmatch(r"\+?[0-9]{8,20}", recipient_value):
+        raise ValueError("A phone recipient must contain only an optional leading + and 8 to 20 digits")
+    if recipient_type != "phone" and (any(char.isspace() for char in recipient_value) or len(recipient_value) > 256):
+        raise ValueError("A BSUID must be an opaque value without whitespace (maximum 256 characters)")
+    payload["recipient"] = {"type": recipient_type, "value": recipient_value}
+else:
+    destination = os.getenv("NVOIP_WA_DESTINATION", os.getenv("NVOIP_TARGET_NUMBER", ""))
+    if not re.fullmatch(r"\+?[0-9]{8,20}", destination):
+        raise ValueError("NVOIP_WA_DESTINATION must be a phone number; use recipient for BSUID")
+    payload["destination"] = destination
+
 body_variables = json.loads(os.getenv("NVOIP_WA_BODY_VARIABLES", "[]"))
 header_variables = json.loads(os.getenv("NVOIP_WA_HEADER_VARIABLES", "[]"))
 
@@ -31,6 +49,8 @@
     payload["headerVariables"] = header_variables
 
 if os.getenv("NVOIP_WA_TO_FLOW", "false").lower() == "true":
+    if recipient_type in {"bsuid", "parent_bsuid"}:
+        raise ValueError("WhatsApp Flow and attendance require a phone recipient")
     payload["functions"] = {"to_flow": True}
 
 response = client.send_whatsapp_template(payload, oauth["access_token"])