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Active Merchant
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For ruby there is a nice library from Shopify offering a huge number of payment gateway integrations: https://github.com/activemerchant/active_merchant
NOTE:
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Hence, a higher number means a more popular project.