refund the payment

Re: refund the payment:

For purchases from Apple: The "Related article" above your question may help:

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Re: i would like to get the full refund from tradingview

The best source of help for a product not made by Apple (a third-party product) is the company or person who made it—its vendor or developer:

Contact a third-party vendor - Apple Support

or

How to contact an app developer - Apple Support

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If you have been accidentally subscribed .... you may need to cancel that to end further charges.

Eg: If you want to cancel a subscription from Apple - Apple Support

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If you still need help:

If your purchase was made through the App Store: You may want to try reaching out to App Store Support

or

You may want to report a problem: https://reportaproblem.apple.com/?s=6

NB: To report a concern about an app, you must provide the URL (web-address) of the app.

Find the URL for an app in the App Store to report a concern - Apple Support

(There is a "Get Support" link (or use the support app) at the bottom of their webpage (link below)

App Store - Official Apple Support

Also: Billing and Subscriptions Support website: Subscriptions and Billing - Official Apple Support