All the endpoints below have a prefix of https://gate.gamingpayments.com/api/v1/ (e.g. POST https://gate.gamingpayments.com/api/v1/purchases/).
You will need your API key that you can obtain in the Developers section in your account. Please use this key as a bearer token in the Authorization header included in every request: Authorization: Bearer <secret key>.
Before starting the development, we recommend checking out the list of ready-to-go connectors to the popular platforms we’ve already built for you. It might save you some precious time if you use one of these to develop your project.
Plugins: WooCommerce, OpenCart, Magento, PrestaShop
Libraries: PHP, Java, C#, Node.js
SDKs: iOS, Android
Online Purchases
Prebuilt checkout (Redirect)
Redirect integration allows running payments using the prebuilt payment flow.
To accept payments in your application or website via redirect, use POST /purchases/ request to create the Purchase and receive the checkout_url. Redirect the customer to the checkout_url to enter their card details for processing. After the payment is processed, the system will redirect the customer back to your website (take note of success_redirect, failure_redirect).
*You have three options to check payment status:*
- Use
success_callback parameter of the Purchase object.
- Use
GET /purchases/<purchase_id>/ request.
- Set up a Webhook using the Developers section of your account or use Webhook API to listen to
purchase.paid, or purchase.payment_failure event on your server.
Setting the skip_capture flag to true allows you to separate the authentication and payment execution steps, allowing you to reserve funds on the customer's card account for some time.
This flag can also enable preauthorization capability, allowing you to save the card without a financial transaction, if possible.
If the customer agrees to store his card for future purchases, there will be an option to pay with a single click next time. To enable this, create a Client object for each of your clients and provide client_id parameter value in your Purchase creation requests.
To create a Purchase or a BillingTemplate, you must specify the Brand ID and API key. You can find both in the Developers section of your account.
Custom checkout — Client side (Direct Post)
Direct post integration allows running payments through the custom payment flow.
To accept payments in your application or website, use POST /purchases/ request to create a Purchase.
To capture customers card details use an HTML <form> hosted on your website with method="POST" and action pointing to the direct_post_url of the transaction.
You will also need to fill the form with <input>'s for the fields with card details. As a result, when a customer submits their card details, it will be posted straight to our system, allowing you to customize the checkout as you wish. At the same time, your PCI DSS requirement is only raised to Self-Assessment Questionnaire (SAQ A-EP), as your system doesn't receive or process card data.
For more details, see the documentation on Purchase's direct_post_url field.
Tokenization & recurring payments
You can store card tokens and charge the respective cards without user interaction if the payment channel supports tokenization.
When you pass remember_card=on to direct_post_url, the respective Purchase's ID will serve as a card token. This initial Purchase will have the is_recurring_token field set to true.
To charge the tokenized card once again, create a new Purchase and then call the POST /purchases/{new_purchase_id}/charge/. In the request body, provide "recurring_token": "initial_purchase_id". When the request succeeds (response code 200), the new Purchase will become paid. The token will be persisted in the Purchase's recurring_token field.
Use "recurring_token": "initial_purchase_id" in all the upcoming POST /purchases/{new_purchase_id}/charge/ requests.
If you wish to delete the recurring token stored for the initial Purchase, use the POST /purchases/{initial_purhcase_id}/delete_recurring_token/ request. Its is_recurring_token will reset to false.
Custom checkout — Server side (Server-to-Server)
Server-to-Server ("S2S") integration allows running payments on the server level without direct interaction between the client’s browser or application and API.
You can build an integration that prevents payers from accessing platform resources directly. In this flow, 3D Secure implementation allows API clients to:
Check 3D Secure enrolment, and if the card is enrolled, receive ACS URL together with all the necessary params for redirection to ACS (PaReq, MD); Redirect the payer to the ACS system of their issuer bank; Receive the payer back and execute the authorization with a separate request.
If the card is not enrolled in 3D Secure, authorization will execute synchronously.
Please note that 3DSv2 which is now the industry standard is fully supported by the S2S flow. While PaReq/PaRes below are 3DSv1 parameters (replaced by creq/cres in 3DSv2 challenge), in case of 3DSv2 proxy ACS solution (where the system is accepting the cardholder navigation using 3DSv1 flow and is performing all parts of 3DSv2 verification and challenge on behalf of merchant) is implemented to maintain API compatibility for older integrations.
To accept payments in your application or website via S2S:
- Ensure the Purchase is created as described in Custom payment flow — Direct Post. As per the Purchase's direct_post_url field description, you will need to ensure all the necessary criteria are met, including success_redirect/failure_redirect fields defined for Purchase and set to arbitrary valid URLs (they will not receive any redirects in the S2S scenario);
- Implement the following request in your server code, appending "?s2s=true" to direct_post_url to form the resulting endpoint (you can obtain the S2S token value from your account manager):
POST {direct_post_url}?s2s=true
Specify the following headers:
Content-Type: application/json Authorization: Bearer {S2S token}
In the request body, provide the following data in JSON (you can omit some of the fields, then system will use default values; We recommend providing correct values from the user’s browser as it can affect 3D Secure success rate):
{ "cardholder_name": "John Doe", "card_number": "4444333322221111", "expires": "01/23", "cvc": "123", "remember_card": "on", "remote_ip": "8.8.8.8", "user_agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36", "accept_header": "text/html", "language": "en-US", "java_enabled": false, "javascript_enabled": true, "color_depth": 24, "utc_offset": 0, "screen_width": 1920, "screen_height": 1080 }
|Field name |Required |Validation criteria/remarks |Default value| |--- |--- |---|--- | |cardholder_name|Y|Latin letters only (space and apostrophe ('), dot (.), dash (-) symbols are also allowed), max 45 characters|| |card_number|Y|text, digits only, no whitespace, max 19 characters|| |expires|Y|text in 'MM/YY' format, digits and a slash only (/^\\d{2}\\/\\d{2}$/), max 5 characters|| |cvc|Y|numeric string of 3 or 4 digits|| |remember_card|N|literal value "on" to save card, any other string otherwise|| |remote_ip|Y|external IP of payer’s browser in IPv4 or IPv6 format|| |user_agent|N|User-Agent as sent by the payer’s browser, max 2048 charge|Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/ 537.36 (KHTML, like Gecko) Chrome/ 88.0.4324.96 Safari/ 537.36| |accept_header|N|Same as above, max 2048 characters|text/html| |language|N|Same as above, max 8 characters|en-US| |java_enabled|N|boolean|false| |javascript_enabled|N|boolean|true| |color_depth|N|integer in 0-255 range|24| |utc_offset|N|integer in -32,768 to 32,767 range|0| |screen_width|N|integer in uint64 range|1920| |screen_height|N|integer in uint64 range|1080|
- If the card is not enrolled in 3S Secure, then a response will contain the field "status" with one of the following values:
"executed" in case of a successful payment authorization; "authorized" in case fund reservation using Purchase.skip_capture was requested; "pending" in case the acquirer was not able to provide final status yet (in this case you need to await a Webhook callback); "error" in case of an authorization error.
Example:
{"status": "executed"}
You will receive "executed", "authorized" or "pending" statuses with a response status code 200 and "error" status - with a status code of 400.
In all of those cases, it is necessary to set up webhooks for purchase events (purchase.paid, purchase.payment_failure at least) to receive further information about the status of the financial transaction.
- If the card is enrolled in 3D Secure, the response will have a status code of 200, the status will be 3DS_required, and the response will contain additional fields:
{ "status": "3DS_required", "Method": "(POST|GET)", "PaReq": "...", "MD": "... (can arrive empty)", "URL": "http://url.of.acs.bank/", "callback_url": "https://..." }
It’s necessary to ensure your client’s browser makes a request with the method specified in Method (GET or POST only) to the ACS of issuer bank returned in "URL", including the values of MD and PaReq as received (use query params in case of GET and request body params in case of POST). Be aware that MD might arrive empty – in that case, you can send it further as an empty string.
In addition to those, you also need to include the `TermUrl` parameter in the client’s browser request, pointing to the URL in your system where the customer’s navigation will be expected. Once the payer approves the transaction, he will be redirected using the POST method to that URL with MD and PaRes params in the request body.
- Once the client is back to
TermUrl in your system and you have received the MD and PaRes, it’s needed to transmit them to the platform to complete the authorization. Send the following request from your server code (no auth headers required):
POST {callback_url from step 4.}
Content-Type: application/x-www-form-urlencoded MD={MD received, if any}&PaRes={PaRes received}
The response will contain the authorization status in JSON format and will be identical to the format described in section 3. Note: it's possible to receive a response code 400 to this request - e.g. in case the acquirer wasn't able to finalize the payment status yet. Please ignore that error response code and await a Purchase callback/final status instead. The same applies if you receive a "pending" status in response.
Testing Integration
It’s possible to test-drive all checkouts using a test Purchase.
For a successful payment, you can use the following card numbers:
- 4444 3333 2222 1111 - non-3D Secure card
- 5555 5555 5555 4444 - 3D Secure card
For both cards, please use:
- any cardholder name
- any expiry larger or equal to the current month/year
- CVC = 123
For a failed payment, please change the CVC or expiration date.
When using a 3D Secure enrolled card in S2S checkout, an incorrect CVC will trigger an authorization failure on the S2S callback step (after the customer returns from test ACS). Using a wrong expiry date emulates data validation failure and results in immediate error before that step.
Billing
Invoicing
To send one-off invoices, use POST /billing/ request. It's similar to POST /purchases/ except that customers are an array, allowing you to bulk-issue invoices to several customers at once.
To send invoices using a template, use a separate POST /billing_templates/ request (without clients!). Then, for each of your clients, use POST /billing_templates/{billing_template_id}/send_invoice/.
If the customer agrees to store his card for future purchases, then the next time the option to pay with a single click will appear if the payment channel supports tokenization.
Subscriptions
Subscriptions allow you to automate recurring purchases. You can create a subscription using the same request POST /billing_templates/ as for invoices. To create a subscription billing template, specify is_subscription: true and subscription_* fields in POST /billing_templates/ request body. Then, add subscribers using the POST /billing_templates/<billing_template_id>/add_subscriber/ request.
If the payment channel supports tokenization and the customer agreed to store his datafor future purchases, payments will be processed automatically, while the customer will get a receipt for each purchase. Note that whenever a subscription payment fails, your customer will automatically receive an invoice he can pay (and store a new card for upcoming payments in the process). Your system will also receive the purchase.subscription_charge_failure webhook event, if configured.
By default, the system generates invoices and processes subscription payments at the beginning of the billing cycle.
If you want to send an invoice or charge a customer at the end of the billing cycle, just set subscription_charge_period_end to true in POST /billing_templates/ request.
The API also provides you with an option to give a trial to your customers before enabling paid subscription period. To do that just set subscription_trial_periods in POST /billing_templates/ request.
Callbacks
Two methods for defining asynchronous callbacks are supported - Purchase success callbacks and webhooks.
Purchase success callbacks
Purchase success callbacks are defined by providing a target URL in the success_callback field on Purchase creation (see POST /purchases/). The system will generate a callback when:
- a
Purchase with skip_capture=false is successfully paid; - a
Purchase with skip_capture=true is successfully captured (see POST /purchases/{id}/capture/); - a
Purchase is successfully paid using a recurring token (see POST /purchases/{id}/charge/);
These callbacks pass a JSON-encoded Purchase as their payload. The payload represents a snapshot of the state of the Purchase when the event was created. The payload will include an event_type field to indicate which specific event (see Event schema) triggered the callback.
The payload is signed using a company-wide key pair. You can obtain the public key with GET /public_key/. See the Authentication section below for more details.
Webhooks
For creating and modifying webhooks, see the Webhook CRUD API specification.
Webhook callback payloads are signed using a dedicated key pair. You can obtain the public key from Webhook.public_key. See the Authentication section below for more details.
Delivery protocol
When a callback is not successfully delivered (received by the target server and responded to with a 200 series HTTP response code), the system will make up to 8 additional attempts at exponentially increasing intervals between attempts. No further delivery attempts will be made if the callback is not successfully delivered 36 hours after triggering.
Please note that due to the asynchronous nature of network requests, it is possible for a callback delivery confirmation (HTTP response with a 200 series status code) to not properly arrive from the callback's target server. Therefore it is possible in case of severe network faults for the target server to receive a callback, respond to it with a 200 series HTTP status code and then receive the same callback after an interval.
Callback deliveries are guaranteed to be sequential to events triggered on their source objects. For example, when registering webhooks for both the purchase.created and purchase.paid events, there will be no purchase.paid callbacks for this Purchase until all purchase.created callbacks for this Purchase are successfully delivered.
Authentication
Payloads are signed using asymmetric A.K.A. public-key cryptography to guarantee the authenticity of delivered callbacks. Each callback delivery request includes an X-Signature header field. This field contains a base64-encoded RSA PKCS#1 v1.5 signature of the SHA256 digest of the request body buffer.
You can obtain the public key for Webhook authentication from Webhook.public_key of the corresponding Webhook.
You can obtain the public key for success callback authentication from GET /public_key/.
Please note the provider is not responsible for any financial losses incurred due to not implementing payload signature verification.