Mobile payments are a strategic move for all gaming companies. They allow scaling to a large user base that pays regular small amounts. To sell mobile games worldwide through mobile payments, we tackled four challenges:

Unify hundreds of different APIs
Unify user journeys and flows
Deliver speed and scalability
Ensure reliability and traceability
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Unify hundreds of different APIs

Each mobile carrier has its own API. The single platform took into account their differences:

●  Support for HTTP and non-HTTP API.

●  Multiple authentication methods

●  Multiple format encoding.

●  Multiple interaction patterns: send a request-read response, send a request-download response, send a request-wait-receive response.

In order to translate all of them into a single standard format, high-level standardization was applied. OPTI found common patterns to organize the variable APIs in less than ten general concepts. The most important concepts were the user (the millions of end clients) and the procedure (an action performed by or for a user, such as a payment, balance-check or refund). Intermediary concepts were used to make the transition from the standard high-level structure to the low-level variable APIs. The standardization used UML in a structured SQL database, and noSQL data stores for non-critical data.

HTTP API interactions
JSON data format
SQL structured data
SSL and token-based security
Communication patterns
Scalable user management

Unify user journeys and flows

The payment platform's purpose was to bring the user from their first access to the completed payment. We took into account:

●  Regulatory differences (country laws)

●  Payment-schedule differences: one-time charging, daily charging, weekly charging etc.

●  Balance checking.

●  Product granularity: One of the thousands of product variants should be delivered to the user based on what he paid.

OPTI extended the high-level standardization in the data structure to the programming code used. Each mobile carrier could be assigned a programmer. But common standards and a mandatory common design are specified.

Treat regulatory differences
SMS payments
Repeat payments
Electronic product delivery
Separation of concerns
Common programming standards

Deliver speed and scalability

The payment platform has to deal with millions to billions of users and procedures. Our top priorities were:

●  Payment speed

●  Payment regularity

●  Distributed nature

●  Natural separation of resources

●  Resources economy

OPTI measured and computed the impact of each procedure on the hardware theoretically, choosing time-tested technologies. A scheduling engine was developed from scratch. We also put business logic in the database itself (i.e. using stored procedures and database triggers)

Quick response and reply
Scheduling engine
Horizontal scaling
Independence of resources
Enhanced multi-threading
Data-driven design
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Ensure reliability and traceability

Any payment system requires the highest level of reliability and traceability:

●  Payment history

●  Atomicity and reversibility

●  Ease of inspection

●  Documentation and ease of on-boarding in place.

OPTI designed a noSQL data store separated from the standard structured SQL data store to record the entire process history. All API interactions are also logged. The project documentation includes the programming standards, the detailed programming structure and the API interaction details.

Payment history
Full logging
NoSQL datastore
Code documentation
API manual
Programming standards


Billions of SMS and mobile payments

The system supports loads of up to one hundred mllion micropayments per day.

Millions of subscribers

Users are subscribed and charged at regular intervals using mobile and SMS payments.

Quality assurance

The system performs reliable balance checking. partial payments, payment retry, payment deferal, payment refund.

Real-time analytics

The systems is integrated with a powerful analytics platform allowing real-time inspection and reaction.

Local and timezone optimization

The system is optimized for country, operator and timezone efficiency, so as to charge users in the best time interval.

Cloud infrastructure

The system runs in the cloud on scalable infrastructure, allowing cost control and easy scaling.

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