How can i use paytm in ios 12.5.7

You can ask the developer to make a version compatible with your device, but since it is no longer receiving software updates from Apple you may find the developer will not want to do that considering that you are using a financial app that requires maximum security.

Click on this link to discover how to contact an app developer - How to contact an app developer - Apple Support

This is something being imposed by the developer of the app you are using, not Apple. You will have to ask them to make a version for your iOS version. Click on this link to discover how to contact an app developer - How to contact an app developer - Apple Support

While your phone may be new to you, older vintage of device

limits its ability to get any newer iOS apps from the App store.

And one path where these third-party apps see update, is get

newer iPhone that runs the most recent supported current iOS.

iOS version by Device - iOS Ref

https://iosref.com/ios

shows versions & most recent/last supported hardware

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Paytm Customer Support Help Centre

//support.paytm.com

Paytm.com - Contact Us

https://paytm.com/contact-us

https://duckduckgo.com/?t=ftsa&q=paytm+app+for+iOS&ia=web

This general search covers most things ~ including their iOS apps.

And they seek to help all their end-users, have secure devices.

This is the main path, and those older iOS are past their prime.

Because the app in question is not an Apple product

you may try to ask the developer from their links to

see what they have planned. Perhaps they might be

able to direct your inquiry to some practical path(?)

Paytm Customer Support Help Centre

//support.paytm.com

Paytm.com - Contact Us

https://paytm.com/contact-us

12.5.7 is the highest iOS your iPhone 6 can run so you will have to buy a newer device if you wish to continue to use that app.

Paytm not saport

I have iphone 6 plus. When i want to open paytm app ,it show me alert message, saying udate new version . How to update paytm new version.

upd now

who can I use Paytm in iPhone