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Please correct me if I have missed anything in my understanding below: 1. The customer's will sign up on your page by entering the details and then they will be registering their card for minimum amount say [url removed, login to view] AED by making a complete transaction. 2. Later, when this customer would call you up for booking, you would tell him the upfront cost and deduct it from the registered card. How to do it using Telr: 1. For the initial transaction, you will need to send the request using Hosted Payment Page V2. The link to the guide is as follows: [url removed, login to view] 2. After a successful transaction, you will receive a transaction reference number in the response which you need to save in your database against the customer. 3. For the follow-up transaction, you will need to send a remote request with transaction type as 'sale' and transaction class as 'cont' for continuous authority. The details are available on the following Link: [url removed, login to view] Please note, you will need to send us a request to enable Remote API on store with the IP address of the server sending details to the server. Let us know if you have any more concerns. Happy to help.