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Sometimes it’s important to validate a promo code or promotion on the client side, e.g., you want to calculate and display a discounted price on the fly. That’s why Voucherify comes with client-side features built into Voucherify JS SDK - an open-source JavaScript library that enables you to query the API. Among other features, it delivers Voucherify React Widgets React Widget Voucherify JS SDK offers many client-side features:
  • validate widget which enables your customers to validate their codes and check its validity in a given context.
  • redeem widget which enables your customers to redeem the promo codes.
  • publish widget which enables your customers to a unique voucher from a given campaign in exchange for providing an email address.
  • subscribe widget which adds a customer to Voucherify. You can then use one of the automatic delivery channels to send him/her a coupon. Read more here.

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API requests rate limit

To keep your vouchers and promotions safe from fraudulent customer behavior, Voucherify limits the rate of public client requests coming from a single IP address. The current limit can be found at Limits section. When the limit is exceeded, Voucherify returns: 
{
    "code": 429,
    "message": "Too many requests hit the API too quickly."
}

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Installation & reference

Visit Github repository to get the current documentation.
To use Voucherify client-side features you have to white-list your domain in the Client-side Settings.
Domain Settings
You have to activate particular client-side options in the Project Settings.
Client-Side Settings