Sir / Madam
Please disabled pay option after paying. Because it’s QR based payment to merchants & We don’t know of name of particular merchant. So why we will pay repeat again payment. If it’s already paid so displayed ‘paid’ option in disabled button 
. Because some payment are hearing sound based but it’s not working then they want repeat payment. Some merchant not understanding about it. While upgrading app. & Want UPI contact if I recived payment from someone.
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Payment history is very important for some users