Error: Class 'ReCaptcha\ReCaptcha' not found in recaptcha_captcha_validation() (line 162

Variation of #5 and #24 worked for me with D9.5.10, recaptcha 8.x-3.2:

Added these lines to recaptcha.module after the last use statement:

require_once dirname(__FILE__) . '/src/ReCaptcha/ReCaptcha.php';
require_once dirname(__FILE__) . '/src/ReCaptcha/RequestMethod.php';
require_once dirname(__FILE__) . '/src/ReCaptcha/RequestParameters.php';
require_once dirname(__FILE__) . '/src/ReCaptcha/Response.php';

Copied these class files from version: v8.x-3.1 of the module into recaptcha/src/ReCaptcha/

Solution from #61 worked for me. Installing with composer command solved the issue:

composer require 'drupal/recaptcha:^3.0'

I have older Drupal 8.9.x website where update would be problematic so I installed recaptcha at first by hand, but came across this error.

I duplicated composer.json file somewhere locally, run the command, copied vendor directory to live website and it started to work.

the solution in #76 worked for me , added the google directory into vendor directory and then added those lines to the recaptcha module as well as the files he includes in the zip to the src/recaptcha directory

Same error for me with Drupal 10 and the latest version of this module.

RE: #79

The Ludwig integration is added recently ✨ reCAPTCHA - Ludwig integration Fixed , so the latest 8.x-3.x-dev can be installed with Ludwig as well. Of course, the Composer is highly recommended whenever possible.

I believe this issue can be closed as outdated. If you have a proper Composer installation or the proper Ludwig + reCAPTHA 8.x-3.x-dev installation and you still experience this issue please feel free to reopen.