Where can I find my receipt/invoice?

You can find all your receipts under Menu => Settings => My Subscription.
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Here's a direct link: https://lnk.bio/manage/subscription

If you have multiple accounts, the invoices are available for each individual account.

For Agencies only

If you have an Agency account, your invoices are under Agency Profile => Agency Subscription.

Here's a direct link: https://lnk.bio/manage/agency/subscription