diff --git a/odoo_whatsapp_hub/models/res_partner.py b/odoo_whatsapp_hub/models/res_partner.py
new file mode 100644
index 0000000..4feace2
--- /dev/null
+++ b/odoo_whatsapp_hub/models/res_partner.py
@@ -0,0 +1,116 @@
+from odoo import models, fields, api
+
+
+class ResPartner(models.Model):
+    _inherit = 'res.partner'
+
+    whatsapp_conversation_ids = fields.One2many(
+        'whatsapp.conversation',
+        'partner_id',
+        string='Conversaciones WhatsApp',
+    )
+    whatsapp_conversation_count = fields.Integer(
+        string='Conversaciones',
+        compute='_compute_whatsapp_conversation_count',
+    )
+    whatsapp_last_conversation_id = fields.Many2one(
+        'whatsapp.conversation',
+        string='Última Conversación',
+        compute='_compute_whatsapp_last_conversation',
+    )
+    whatsapp_unread_count = fields.Integer(
+        string='Mensajes No Leídos',
+        compute='_compute_whatsapp_unread_count',
+    )
+
+    @api.depends('whatsapp_conversation_ids')
+    def _compute_whatsapp_conversation_count(self):
+        for partner in self:
+            partner.whatsapp_conversation_count = len(partner.whatsapp_conversation_ids)
+
+    @api.depends('whatsapp_conversation_ids.last_message_at')
+    def _compute_whatsapp_last_conversation(self):
+        for partner in self:
+            conversations = partner.whatsapp_conversation_ids.sorted(
+                'last_message_at', reverse=True
+            )
+            partner.whatsapp_last_conversation_id = conversations[:1].id if conversations else False
+
+    @api.depends('whatsapp_conversation_ids.unread_count')
+    def _compute_whatsapp_unread_count(self):
+        for partner in self:
+            partner.whatsapp_unread_count = sum(
+                partner.whatsapp_conversation_ids.mapped('unread_count')
+            )
+
+    def action_open_whatsapp_conversations(self):
+        """Open WhatsApp conversations for this partner"""
+        self.ensure_one()
+        return {
+            'type': 'ir.actions.act_window',
+            'name': f'Conversaciones - {self.name}',
+            'res_model': 'whatsapp.conversation',
+            'view_mode': 'tree,form',
+            'domain': [('partner_id', '=', self.id)],
+            'context': {'default_partner_id': self.id},
+        }
+
+    def action_send_whatsapp(self):
+        """Open wizard to send WhatsApp message"""
+        self.ensure_one()
+        phone = self.mobile or self.phone
+        if not phone:
+            return {
+                'type': 'ir.actions.client',
+                'tag': 'display_notification',
+                'params': {
+                    'message': 'El contacto no tiene número de teléfono',
+                    'type': 'warning',
+                }
+            }
+
+        return {
+            'type': 'ir.actions.act_window',
+            'name': 'Enviar WhatsApp',
+            'res_model': 'whatsapp.send.wizard',
+            'view_mode': 'form',
+            'target': 'new',
+            'context': {
+                'default_partner_id': self.id,
+                'default_phone': phone,
+            },
+        }
+
+    def action_open_whatsapp_chat(self):
+        """Open or create WhatsApp conversation"""
+        self.ensure_one()
+        phone = self.mobile or self.phone
+        if not phone:
+            return {
+                'type': 'ir.actions.client',
+                'tag': 'display_notification',
+                'params': {
+                    'message': 'El contacto no tiene número de teléfono',
+                    'type': 'warning',
+                }
+            }
+
+        account = self.env['whatsapp.account'].get_default_account()
+        if not account:
+            return {
+                'type': 'ir.actions.client',
+                'tag': 'display_notification',
+                'params': {
+                    'message': 'No hay cuenta WhatsApp configurada',
+                    'type': 'warning',
+                }
+            }
+
+        conversation = self.env['whatsapp.conversation'].find_or_create_by_phone(
+            phone=phone,
+            account_id=account.id,
+            contact_name=self.name,
+        )
+        conversation.partner_id = self.id
+
+        return conversation.action_open_chat()