its based system unique id. User sent product id to you. you create a key for that sent back to user. User can apply and activate after the payment with the money that customers send to pay for invoices related to their subscriptions. The Payment object holds all of the information about an individual payment, including the payment amount and to which invoices the payment was applied to. Create Payment Using InvoiceId and InvoiceNumber
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Hello, I am a c# developer and I understand your need to develop a plan activation serial generator api. I will be available for further discussion to fully understand your requirement
I can do your project, I have done several related projects so it would be an easy task for me. Chat with me and let me show you the samples. Hoping to work with you soon.