Requirements

Mandatory

• PHP 8.0+

• A PSR-17 (HTTP Message Factory) implementation

• A PSR-18 (HTTP Client) implementation

• The JSON extension

Optional

• A PSR-3 (Logger Interface) implementation for debugging

Extension Specific

VAPID extension

• Required:

  • openssl extension

  • mbstring extension

Payload extension

• Required:

  • openssl extension

  • mbstring extension