PaystackFeign -- WIP

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Library for easy interaction with Paystack API using Feign.

Feign is a Java to HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket.

Requirements

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• Java 11

Dependencies defined in pom.xml:

@FasterXML/jackson-annotations com.fasterxml.jackson.core:jackson-annotations 2.12.1
@FasterXML/jackson-databind com.fasterxml.jackson.core:jackson-databind >= 2.9.10.7
@OpenFeign/feign io.github.openfeign:feign-core 10.12
@apache/maven-plugins org.apache.maven.plugins:maven-compiler-plugin 3.8.1
@projectlombok/lombok org.projectlombok:lombok 1.18.20

Getting started

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This library is using Jackson at the moment, but goal is to introduce 2 modules to support both Jackson and Gson depending what is already on the classpath.

To start using you need to create a PaystackPaymentAPI bean using Feign, also HystrixFeign can be used or Resilience4jFeign if you want to have CircuitBreaker.
Secret Key is the one that you can get from Paystack Dashboard, and add to the bean from Environment Variables, or application properties, or just hard-code(not advised)

@Bean
public PaystackPaymentAPI paystackPaymentAPI()
{
    return Feign.builder()
        .encoder(new JacksonEncoder()) // You can uses Gson as well
        .decoder(new JacksonDecoder()) // You can uses Gson as well
        //If you have [error code: 1010] and HTTP code 403, this means calls are blocked by Cloudflare for example, due to not correct User-Agent, in this case valid web user agent can be used, like:
        .requestInterceptor(new UserAgentInterceptor("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36"))
        .requestInterceptor(new AuthorizationInterceptor(secretKey))
        .target(PaystackPaymentAPI.class, "https://api.paystack.co");

}

Currently, supported entities and endpoints

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Transaction:

• Initialize Transaction
• Verify Transaction
• List Transactions
• Fetch Transaction
• Charge Authorization
• Check Authorization
• View Transaction Timeline
• Transaction Totals
• Export Transactions
• Partial Debit

Customer:

• Create Customer

Plans:

• Create Plan

ToDos

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• divide library into 3 modules: core, paystackfeign-gson, paystackfeign-jackson
• check what library currently used in the classpath and load respective module
• Finish Transactions API
• Finish Transaction Splits API
• Finish Customer API
• Finish Subaccounts API
• Finish Plans API
• Finish Subscriptions API
• Finish Products API
• Finish Payment Page API
• Finish Invoices API
• Finish Settlements API
• Finish Bulk Charges API
• Finish Settlements API
• Finish Charge API
• Finish Disputes API
• Finish Refunds API