Build the stuff for payments.

app/Models/Payment.php

@@ -3,9 +3,58 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Support\Facades\Date;
 
 class Payment extends Model
 {
-    use SoftDeletes;
+    public $timestamps = false;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<int, string>
+     */
+    protected $fillable = [
+        'invoice_id',
+        'paid_amount',
+        'status',
+        'payment_method',
+        'payment_date',
+    ];
+
+    /**
+     * The attributes that are appended with attribute getters.
+     *
+     * @var string[]
+     */
+    protected $appends = [
+        'date',
+        'localized_state'
+    ];
+
+    /**
+     * Get the payment state as translated string.
+     */
+    public function getLocalizedStateAttribute(): string
+    {
+        return __('invoice.Payment state ' . $this->status);
+    }
+
+    /**
+     * Get the payment date as localized string.
+     */
+    public function getDateAttribute(): string
+    {
+        return Date::createFromFormat('Y-m-d', $this->payment_date)->format('d.m.Y');
+    }
+
+    /**
+     * Get the invoice the payment belongs to.
+     */
+    public function invoice(): BelongsTo
+    {
+        return $this->belongsTo(Invoice::class);
+    }
+
 }