Install the module
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Open the module page in the 1C-Bitrix marketplace.
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Click Install.

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Enter the address of your site or portal and confirm.

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The External solution update system page opens in a new browser tab. Click Download.

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Read and accept the license agreement. Wait for the module to download.
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When the module downloads, click Install in the window that opens.

What's next
To accept payments using Yandex Pay, set up the payment system in the 1C-Bitrix personal account.