Hi there,
I can certainly help you in the integration of the Credit Agricole payment gateway into RS membership (by RSJoomla) on a Joomla website (3.9.21).
I am carrying over 10 years of experience in working on the various CMS's like Joomla, WordPress, Drupal, Squarespace, Typo3, etc.
I am available to start the work immediately.
Feel free to connect.
Speak soon.
Regards,
Gaurav