diff --git a/backend/app/Models/Caja.php b/backend/app/Models/Caja.php
new file mode 100644
index 0000000..62373fa
--- /dev/null
+++ b/backend/app/Models/Caja.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use App\Traits\UuidPrimaryKey;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Caja extends Model {
+    use UuidPrimaryKey, SoftDeletes;
+
+    protected $table = 'cajas';
+
+    public function restaurante() {
+        return $this->belongsTo(Restaurante::class);
+    }
+}
diff --git a/backend/app/Models/Efectivo.php b/backend/app/Models/Efectivo.php
new file mode 100644
index 0000000..07da79f
--- /dev/null
+++ b/backend/app/Models/Efectivo.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use App\Traits\UuidPrimaryKey;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Efectivo extends Model {
+    use UuidPrimaryKey, SoftDeletes;
+
+    protected $table = 'efectivos';
+
+    public function caja() {
+        return $this->belongsTo(Caja::class);
+    }
+}
diff --git a/backend/app/Models/MedioPago.php b/backend/app/Models/MedioPago.php
new file mode 100644
index 0000000..879bf43
--- /dev/null
+++ b/backend/app/Models/MedioPago.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models;
+
+use App\Traits\UuidPrimaryKey;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class MedioPago extends Model {
+    use UuidPrimaryKey, SoftDeletes;
+
+    protected $table = 'medios_pago';
+}
diff --git a/backend/app/Models/Venta.php b/backend/app/Models/Venta.php
index 488fbd3..0357c70 100644
--- a/backend/app/Models/Venta.php
+++ b/backend/app/Models/Venta.php
@@ -23,6 +23,14 @@ class Venta extends Model {
         return $this->belongsTo(Restaurante::class);
     }
 
+    public function caja() {
+        return $this->belongsTo(Caja::class);
+    }
+
+    public function medioPago() {
+        return $this->belongsTo(MedioPago::class);
+    }
+
     public function productos() {
         return $this->hasMany(VentaProducto::class);
     }