Build the stuff for payments.

app/Models/Invoice.php

@@ -38,8 +38,6 @@ class Invoice extends Model
 
     /**
      * Get the invoice state as translated string.
-     *
-     * @return string
      */
     public function getLocalizedStateAttribute(): string
     {
@@ -56,35 +54,57 @@ class Invoice extends Model
 
     /**
      * Get the created_at attribute in local time format.
-     *
-     * @return string
      */
     public function getCreatedAttribute(): string
     {
         return $this->created_at->format('d.m.Y');
     }
+
+    /**
+     * Get the user, that has created the invoice.
+     */
     public function user(): BelongsTo
     {
         return $this->belongsTo(User::class);
     }
 
+    /**
+     * Get the invoice's customer.
+     */
     public function customer(): BelongsTo
     {
         return $this->belongsTo(Customer::class);
     }
 
+    /**
+     * Get the invoice's address.
+     */
     public function address(): BelongsTo
     {
         return $this->belongsTo(Address::class)->withTrashed();
     }
 
+    /**
+     * Get the invoice's delivery address.
+     */
     public function delivery(): BelongsTo
     {
         return $this->belongsTo(Address::class)->withTrashed();
     }
 
+    /**
+     * Get the items (invoice positions) of this invoice.
+     */
     public function items(): HasMany
     {
         return $this->hasMany(Invoiceitem::class);
     }
+
+    /**
+     * Get the payments for the invoice
+     */
+    public function payments(): HasMany
+    {
+        return $this->hasMany(Payment::class);
+    }
 }

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);
+    }
+
 }