Add all files

app/Admin/Resources/InvoiceResource/RelationManagers/TransactionsRelationManager.php

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+<?php
+
+namespace App\Admin\Resources\InvoiceResource\RelationManagers;
+
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\RelationManagers\RelationManager;
+use Filament\Support\RawJs;
+use Filament\Tables;
+use Filament\Tables\Table;
+
+class TransactionsRelationManager extends RelationManager
+{
+    protected static string $relationship = 'transactions';
+
+    public function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                Forms\Components\Select::make('gateway.name')
+                    ->label('Gateway')
+                    ->relationship('gateway', 'name')
+                    ->searchable()
+                    ->preload()
+                    ->placeholder('Select the gateway'),
+                Forms\Components\TextInput::make('transaction_id')
+                    ->label('Transaction ID'),
+                Forms\Components\TextInput::make('amount')
+                    ->label('Amount')
+                    ->numeric()
+                    ->mask(RawJs::make(
+                        <<<'JS'
+                            $money($input, '.', '', 2)
+                        JS
+                    ))
+                    ->required(),
+                Forms\Components\TextInput::make('fee')
+                    ->numeric()
+                    ->mask(RawJs::make(
+                        <<<'JS'
+                            $money($input, '.', '', 2)
+                        JS
+                    ))
+                    ->label('Fee'),
+            ]);
+    }
+
+    public function table(Table $table): Table
+    {
+        return $table
+            ->recordTitleAttribute('transaction_id')
+            ->columns([
+                Tables\Columns\TextColumn::make('gateway.name')->label('Gateway'),
+                Tables\Columns\TextColumn::make('transaction_id'),
+                Tables\Columns\TextColumn::make('formattedAmount')->label('Amount'),
+                Tables\Columns\TextColumn::make('formattedFee')->label('Fee'),
+                Tables\Columns\TextColumn::make('created_at'),
+            ])
+            ->filters([
+                //
+            ])
+            ->headerActions([
+                Tables\Actions\CreateAction::make(),
+            ])
+            ->actions([
+                Tables\Actions\DeleteAction::make(),
+            ])
+            ->bulkActions([
+                Tables\Actions\BulkActionGroup::make([
+                    Tables\Actions\DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+}