Payment Link request for an existing invoice ID

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The **Get Payment Link** endpoint allows clients to generate or retrieve a secure payment URL associated with a specific invoice. By providing a valid `invoiceId`, the API returns a unique payment link that can be shared with the customer for completing the transaction. This link ensures a safe and traceable payment process, tied directly to the requested invoice, and helps streamline billing workflows without exposing sensitive financial details in the request. **Typical Use Cases:** - Sending payment links to customers for outstanding invoices. - Embedding secure payment URLs in email, SMS, or portal notifications. - Automating invoice-to-payment workflows within billing or ERP systems.