Here’s a step-by-step guide to using the Stripe Treasury API with PHP. Stripe Treasury lets you build financial services like bank accounts, fund transfers, and payments into your application. Here’s how to integrate it:

1. Install the Stripe PHP SDK

First, install the Stripe PHP SDK via Composer if you haven't already:

   composer require stripe/stripe-php

This SDK provides all the functions to interact with Stripe’s API, including Treasury.

2. Set Up Stripe Account and API Keys

• Log in to your Stripe dashboard and go to the API keys section.
• Obtain the Secret Key and Publishable Key.
• For Treasury, make sure you have access to the necessary permissions by contacting Stripe if needed.

3. Initialize Stripe in Your PHP Script

In your PHP file, include the Stripe PHP SDK and initialize the client with your API keys:

   require 'vendor/autoload.php';
   \Stripe\Stripe::setApiKey('your_secret_key');

4. Create a Financial Account

A Financial Account is necessary to hold funds and perform transfers. To create one, use the following code:

   $financialAccount = \Stripe\Treasury\FinancialAccount::create([
       'supported_currencies' => ['usd'],  // add more currencies if needed
       'features' => [
           'inbound_transfers' => ['ach' => ['requested' => true]],
           'outbound_payments' => ['ach' => ['requested' => true]],
           'card_issuing' => ['requested' => true],
       ],
   ]);

   echo 'Financial Account ID: ' . $financialAccount->id;

This will create a financial account in USD with ACH transfers enabled.

5. Fund the Financial Account

To add funds, create an inbound transfer. In production, you would connect a source, like a linked bank account.

   $inboundTransfer = \Stripe\Treasury\InboundTransfer::create([
       'amount' => 10000,  // amount in cents
       'currency' => 'usd',
       'financial_account' => $financialAccount->id,
       'origin_payment_method' => 'your_payment_method_id',
   ]);

   echo 'Inbound Transfer ID: ' . $inboundTransfer->id;

Replace 'your_payment_method_id' with the actual ID of the funding source.

6. Create Outbound Payments

With Stripe Treasury, you can make outbound payments to external bank accounts or other financial accounts.

   $outboundPayment = \Stripe\Treasury\OutboundPayment::create([
       'financial_account' => $financialAccount->id,
       'amount' => 5000,  // amount in cents
       'currency' => 'usd',
       'destination_payment_method' => 'your_destination_payment_method_id',
   ]);

   echo 'Outbound Payment ID: ' . $outboundPayment->id;

Here, 'your_destination_payment_method_id' represents the destination where funds will be sent.

7. Handle Transfers Between Financial Accounts

To transfer funds between two Stripe financial accounts, use the OutboundTransfer feature.

   $outboundTransfer = \Stripe\Treasury\OutboundTransfer::create([
       'financial_account' => $financialAccount->id,
       'destination_payment_method' => 'destination_account_id',
       'amount' => 3000,  // amount in cents
       'currency' => 'usd',
   ]);

   echo 'Outbound Transfer ID: ' . $outboundTransfer->id;

Make sure the destination account is set up to accept payments.

8. Monitor and Verify Treasury Transactions

You can retrieve and verify transactions to ensure everything is processed correctly:

   $transaction = \Stripe\Treasury\Transaction::retrieve('transaction_id');
   echo 'Transaction Status: ' . $transaction->status;

Replace 'transaction_id' with the actual ID of the transaction you want to track. You can also list all transactions associated with the financial account.

Tips:

• Error Handling: Wrap API calls in try-catch blocks to handle exceptions.
• Testing: Use Stripe’s sandbox environment (test mode) to validate the integration before going live.
• Webhook Setup: Stripe Treasury processes might involve asynchronous events, so consider setting up webhooks to monitor changes (like transfer status) in real-time.

By following these steps, you should be able to use Stripe Treasury API to build financial services in your PHP application.

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