What i need Development or Production Push SSL Certificate in APNs?

I want to activate Apple Push notification service in my application and this application which i am building is for client, and i don't know that how many client will be further use this 开发者_Python百科application or installed on how many devices, so i am little confuse that what i actually need Development or production Push SSL certificate?

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Follow APNS-Development push SSL or Production push SSL?

Step by Step SetUp for pushNotification

How to Configure & Send Apple Push Notifications using PushSharp