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PayPal
PayPal provides a global online payment platform
PayPal API is a globally renowned online payment system, established in 1998, offering secure and diverse payment options in over 200 countries. PayPal supports transactions in numerous currencies and is especially popular for its user-friendly interface and the protection of sensitive financial information. Countries Global

Currencies Multiple (including AUD, BRL, CAD, CZK, DKK, EUR, GBP, HKD, HUF, ILS, JPY, MXN, MYR, NOK, NZD, PHP, PLN, SEK, SGD, THB, TWD, USD)
*see processing notes for specific currencies in the principles of operation.
Recurring Yes

Refund Yes

Chargeback Yes

Principle of operation


  1. Order initiation: Creates an order in the system and returns a JavaScript URL to invoke the PayPal button.
  2. PayPal button integration: Insert the provided script into your website's HTML where the PayPal button should appear.
  3. Payment process: Customers select PayPal at checkout, link bank accounts or cards, or use their PayPal balance for transactions.
  4. Subsequent payments:
    • One-click: Tokenizing PayPal payment information in the first transaction allows customers to complete subsequent payments with just a tap of the pay button.
    • Recurring: Tokenization process extends to Guide
      Create and maintain a stable and healthy business subscription model.
      subscriptions
      models, where a PayPal payment token handles recurring transactions.

For Currencies COP, CRC, HUF, LAK, RSD, and TWD, merchants should pass the integer value of the amount with two zeros at the end (for example, XXXX00, which will be transferred to PayPal as XXXX.00).

This approach ensures the accuracy of the payment amount transferred to PayPal. If this format is not followed, the payment amount will be rounded up (for example, from XXX0.99 to XXX1.00 and from XXX0.01 to XXX1.00), potentially affecting the transaction’s precision.

Additionally, the PayPal dispute API report provides comprehensive information about each dispute. Guide
Effectively managing PayPal disputes and chargebacks.
PayPal risk metrics
should also be considered to effectively track and manage disputes and chargebacks.

Integration flow


  1. Obtain PayPal sandbox credentials from your Account Manager or request the Solidgate support team.
  2. Follow the detailed documentation after receiving the API keys for the PayPal sandbox environment.
  3. Initiate the payment process by sending an init request API and then integrate the PayPal button using the provided script_url.
  4. Customize the PayPal button appearance using the initialization parameters provided to match your website’s design and branding.

Subscribe to these PayPal button events to track the transaction status:

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<div id="paypal-button"></div>
<script>
  var elem = document.getElementById('paypal-button');
  elem.addEventListener('order-started-processing', function (e) {
    console.log('order-started-processing',e);
  }, false);
  elem.addEventListener('order-started-approved', function (e) {
    console.log('order-approved',e);
  }, false);
  elem.addEventListener('order-processed', function (e) {
    console.log('order-processed',e);
  }, false);
  elem.addEventListener('order-already-processed', function (e) {
    console.log('order-already-processed', e)
  }, false);
  elem.addEventListener('button-ready', function (e) {
    console.log('button-ready', e)
  }, false);
  elem.addEventListener('button-error', function (e) {
    console.log('button-error',e);
  }, false);
  elem.addEventListener('button-click', function (e) {
    console.log('button-click',e);
  }, false);
  elem.addEventListener('button-cancel', function (e) {
    console.log('button-cancel',e);
  }, false);	
  <script type="text/javascript"
          src="https://gate.solidgate.com/widget/9d81b91uisf234bhjb23jhb562cc5101"
          data-label="checkout"
          data-color="blue"
          data-shape="rect"
  >
  </script>

Handling decline code

The decline code Guide
The payment was not completed within the allocated timeframe, leading to order expiration.
0.02 Order expired
, helps in identifying cases where an order was created due to PayPal button initialization but no attempts were made to pay via PayPal.

  • Order creation: PayPal orders are generated with each successful initiation request for the PayPal button.
  • Customer payment choice: Sometimes, a customer might opt to pay via a card or select an alternative payment method instead of PayPal.
PayPal button activity duration
  • Time limit: The PayPal button remains active for one hour post-initialization.
  • Inactivity result: If there are no attempts to make a payment via PayPal within this hour, a declined order with the 0.02 decline code is issued.
An example of how such an order appears can be found in our admin panel, specifically in HUB.

Billing agreement

A billing agreement is a contract between the end user and your platform. It grants you permission to withdraw funds from their account in the future, eliminating the need for them to log into their PayPal account for each subsequent transaction. This streamlines the payment process, ensuring seamless transactions without additional sign-ins.

It is recommended to consult the official PayPal documentation for comprehensive understanding and guidance.

This token is especially useful for Merchant Initiated Transactions (MITs) in subscription models, as it allows for automatic, recurring billing without necessitating the customer’s presence on the site.

This seamless integration offers convenience for both the merchant and the customer, ensuring transactions are smooth and uninterrupted.

Create a payment token

To create a payment token via Solidgate, initiate a billing agreement with PayPal that returns a token following a successful user approve, set the amount to 0 .

This token can be used for subsequent charges.
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POST https://gate.solidgate.com/api/v1/init-payment
Merchant: {{...}}
Signature: {{...}}

{
  "payment_method": "paypal-vault",
  "amount": 0,
  "currency": "EUR",
  "order_id": "buy_73243.pay_token",
  "customer_email": "user-one@mail.com",
  "ip_address": "109.234.2.87",
  "order_description": "obtain pay token",
  "platform": "WEB"
}

Retrieve the script_url from the response and embed it on the webpage.

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{
  "order": {
    "amount": 0,
    "currency": "EUR",
    "order_id": "buy_73243.pay_token",
    ....
  },
  "pay_form": {
    "script_url": "https://gate.solidgate.com/widget/5f9f74abec73952652ed964d4efd8.js"
  }
  "transactions": [...]
}

Upon successful script loading, a PayPal button will be rendered on the page for payment. Once the user authorizes the payment, the event contains the order and customer information.

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<script>
  var elem = document.getElementById('paypal-button');
  elem.addEventListener('order-approved', function (e) {
  console.log('order-approved', e.detail.data)
}, false);
</script>

Order status can be extracted from e.detail.data, which adheres to the standard structure of an order status response.

The same data can also be obtained via an H2H Check order status API method. The order-approved event will also be duplicated via webhook, allowing real-time status updates.

Importantly, save order: token for future recurring payments.

Subsequent charges

Execute recurring charges following the prescribed methodology outlined in Solidgate’s documentation for standard recurring API billing procedures.

Use the previously obtained payment token to initiate the transaction.
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POST https://gate.solidgate.com/api/v1/recurring
Merchant: {{...}}
Signature: {{...}}

{
  "token": "435ft34f5345gh34f5h34g5f3h4",
  "product_id": "faca5fc6-3160-4444-84fe-403199ca07d3",
  "order_id": "buy_73243",
  "customer_email": "user-one@mail.com",
  "ip_address": "109.234.2.87",
  "order_description": "package purchase",
  "platform": "WEB"
}
Error сodes:
Guide
“Invalid data” code message is used for validation errors, with the reason for the validation triggering specified in the body (object error) of the response. Also, the code message “Order not found” is used as a decline on orders in case of API response to request on non-existent order.
2.01 General reason
: If the request for zero-amount is declined.
Guide
An error occurred due to the processor not supporting the requested API method.
5.10 Processor does not support requested API method
: If your payment provider doesn't support this method.

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