Perkville
Sometimes customers need an incentive to refer their friends to your business. Perkvilleaccomplishes this with their customer reward service. What’s cool about Perkville is that it’s online (no cards), it’s easy to set up, and it rewards your customers for loyalty as well as for referring friends and promoting you on social networks like Facebook and Twitter. Also, it’s free 
Rewards
Perkville makes it easy to set up a custom reward program for your business. Here is an example for Saffron Rare Threads, a high-end boutique clothing store in San Francisco:
See more examples on Perkville.
Referrals
Perkville provides an online form so your customers can easily refer their friends to your business. Referrals are automatically tracked and rewarded:
Social Media
You can reward customers for social media activity such as promoting your business on Facebook and following it on Twitter.
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More MerchantOS Features
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Work Orders / Service Dept.
The work order module organizes your service department. It helps you keep track of what needs to be done, what’s been paid for and customer service history.
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Inventory Control
Inventory control is the the part of the system that helps you manage your inventory. It allows you to create item descriptions, track purchase orders, and count inventory.
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Security
No jokes when it comes to security. We use SSL encryption, hardened data centers, firewalls, and other measures to protect your data.
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Integrations
Native integrations with best-of-breed accounting (QuickBooks), E-commerce, invoicing and marketing tools streamline your business.
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Web Based Point of Sale
We store your data on our secure servers hosted in multiple data centers with real-time backups. This means no matter what happens, your data is always safe and available.
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Cloud Based Point of Sale
We store your data on our secure cloud hosted in multiple data centers with real-time backups. This means no matter what happens, your data is always safe and available.