The Payment System provides a functionality through which a subscription can be created by a merchant and recurring payments can be done using that subscription. See Subscription API for the possible API requests.
Subscription Flow
The data flow for subscription is as followed:

Steps:
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Create a new subscription.
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Initial payment
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Create a new order for a subscription.
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Start initial payment.
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Recurring payment
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Create a new order for a subscription for each recurring payment.
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Start recurring payment