Option to add installment to contract/account to increace balance amount same as payment and can be deleted which will reduce balance amount by new amount of the installment deleted, call later added badge to show active call laters

app/Http/Requests/StoreInstallmentRequest.php

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+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreInstallmentRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'amount' => ['required', 'numeric', 'min:0.01'],
+            'currency' => ['nullable', 'string', 'size:3'],
+            'reference' => ['nullable', 'string', 'max:100'],
+            'installment_at' => ['nullable', 'date'],
+            'meta' => ['nullable', 'array'],
+        ];
+    }
+}

app/Http/Requests/UpdateInstallmentSettingRequest.php

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+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateInstallmentSettingRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'default_currency' => ['required', 'string', 'size:3'],
+            'create_activity_on_installment' => ['sometimes', 'boolean'],
+            'default_decision_id' => ['nullable', 'integer', 'exists:decisions,id'],
+            'default_action_id' => ['nullable', 'integer', 'exists:actions,id'],
+            'activity_note_template' => ['nullable', 'string', 'max:255'],
+        ];
+    }
+}