Fix Invoice/Estimate template issues and Add Payment Receipt, Custom Payment Modes and Item units

app/Http/Requests/UnitRequest.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Crater\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UnitRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        $data = [
+            'name' => 'required|unique:units,name'
+        ];
+
+        if ($this->getMethod() == 'PUT') {
+            $data['name'] = [
+                'required',
+                Rule::unique('units')->ignore($this->route('unit'), 'id')
+            ];
+        }
+
+        return $data;
+    }
+}