This is an internal app, which often requires specific, sometimes "unofficial," installation methods (e.g., enabling "Unknown Sources" in Android security settings). Exclusively for Active Staff:
The App Saludanz Recibo de Pago is not a hidden feature, but it is often confused with store receipts from Apple/Google. If you subscribed via the app store, your receipt is there. If you subscribed via the web, check your email or the web dashboard. app saludanz recibo de pago new