You can send GET or POST requests, and you'll receive a push notification immediately upon success.
URL structure: The first part is the key, followed by three matches
/:key/:body 
/:key/:title/:body 
/:key/:title/:subtitle/:body 
title: The push title, slightly larger than the body text 
subtitle: The push subtitle
body: The push content, use the newline character '\n' for line breaks 
For POST requests, the parameter names are the same as above
Parameters

// Click on the push notification to jump to the specified URL
https://api.day.app/yourkey/url?url=https://www.google.com 
group
// Specify the push message group to view pushes by group.
https://api.day.app/yourkey/group?group=groupName
icon (supported on iOS 15 and above)
// Specify the push message icon
https://api.day.app/yourkey/icon?icon=http://day.app/assets/images/avatar.jpg
sound
// Specify the push message sound
https://api.day.app/yourkey/sound?sound=alarm
// Play sound repeatedly for 30 seconds
https://api.day.app/yourkey/call?call=1
ciphertext
// Encrypted push message
https://api.day.app/yourkey/ciphertext?ciphertext=
Time-sensitive notifications
// Set time-sensitive notifications
https://api.day.app/yourkey/时效性通知?level=timeSensitive
// Optional values 
// active: Default value when not set, the system will immediately display the notification by lighting up the screen. 
// timeSensitive: Time-sensitive notification, can be displayed during focus mode. 
// passive: Adds notification to the notification list without lighting up the screen.
Critical alerts
// Set critical alerts
https://api.day.app/yourkey/criticalAlert?level=critical
Critical alerts will ignore silent and do not disturb modes, always playing the notification sound and displaying on the screen.
Others

Online Scheduled Sending
Windows Push Client
Cross-platform Command Line Application
Bark GitHub Actions
Quicker Actions
Bark for Wox
bark-jssdk
bark.js
java-bark-server
bark-java-sdk
Python for Bark
uTools for Bark