Working for Payment Card Industry Data Security Standard - Will my income be Halaal?

Assalamu Alaikum.
Firstly thank for such an excellent site which is much needed. I really appreciate your assistance with this and May Allah swt reward you abundantly for your kind deeds.


I have had a and excellent job offer from a company just yesterday which I am seriously considering. I have some queries if my income will potentially be haram.
I know you must be quite busy but I have to give them an answer quickly so I would appreciate if you can promptly reply.

 
The company, job and people seem really nice and they have agreed to all my requests such as place of worship, extended lunch break for Jumma, etc.
I will try and explain what the company does and my potential duties will be.
 
The company develops/sells/supports hardware and software which allows their clients to secure credit card transactions. It basically protects the end users credit card details from any fraud and protects the client from getting into trouble and reduce liability. It also helps protect credit card issuers ( i.e. banks that issue these credit cards to their customers)
 

The company’s motto  :
 
‘To specialise in PCI DSS Call Centre solutions enable businesses to deliver a premium customer experience while ensuring PCI DSS Compliance. Our solutions have been developed to securely capture customer payments in a compliant manner – either with the agent, webchat or via the IVR’
 
PCI-DSS is what this company does/implements. More details can be found below. The second link explains it quite well.
 
 https://www.pcisecuritystandards.org/pci_security/
 https://en.wikipedia.org/wiki/Payment_Card_Industry_Data_Security_Standard
 
 
Eg. The product is sold to a customer/company who uses it in their call centre.
 
End User 'A' calls the Customer/Company 'B' and either purchases something or pays a bill. If user A decides to pay using his/her credit card (which is being the norm), our product will securely capture the credit card digits without revealing the digits to the call centre agent and send these details to a payment gateway (that eventually authenticates with the credit card issuing bank) and returns a receipt back to the call centre agent or user A. At this point the payment is accepted or rejected.
 
This transaction could also occur through an IVR or webchat session (i.e without directly speaking with a call centre agent).
 
We store the credit card details securely and charge the Customer/Company A, a small fee for processing the transaction. eg 5 or 10 cents per transaction.  We also make money on delivering payment or non-payment related calls to them, i.e similar to charging telephone line rental (but on a larger scale).
 
 
Installing our system will also help the customers improve profit as they don't have to spend money on other solutions to minimise customer service agents from copying credit card details of customers.
 
Other work involves auditing a customer’s environment to identify the risk level and how we can help minimise risk.
 
My job will be to install, configure, improve/develop and support the system. I am not directly writing the software but helping implement and also work very closely with the software developers to fix issues and add features.
 
 
 
Two questions.
 
1. Are there any issues that could arise from making money from the credit card transactions? I am worried that we are encouraging users to pay using credit card but at the same time protecting them as well. Also if a customer uses a credit card, we don’t know if they are potentially going to incur Riba eg, if they don’t pay off the credit card on time. Please note that I will not be directly handling any monetary transactions as my job is install, configure, improve/develop and support the system.
 
2. They have few insurance companies out of a long list as their customers with a potential of more coming on board as this is a target market. They may also get a customer who is a casino. I have mentioned to them that I am anti-gambling. In relation to this casino, they are only dealing with merchants/restaurants, gyms, hotels, etc that are part of the casino and not the gambling side of the business.  They also assured me that they will not be targeting online gambling companies of any kind.

This is an Australian based company. 
I have had an extensive search on your excellent site but I am still confused.

Looking forward for a response from you.
 
Jazak Allah Khairan and Walaikum Assalaam