In order to become a member of Marihuana Shop you need to fill out the contact from at their home page www.marihuanashop.com or send them a private message to their Facebook page.
You need to be 21+ and provide an address in Barcelona. Don’t say you are staying in a hotel, if they think you’re a tourist, you may be rejected. You need to bring a valid ID. Credit cards or Student IDs are not valid forms of identification.
Once they answer you, and you give them all your details, they’re gonna tell you to go to the club for an interview.
The Marihuana Shop may not be the best club for low-budget tourists. The membership registration process is done by the book. You need to go to an informative presentation, then they will make you complete a short interview and then proceed with the registration process. Even after all that, some people get rejected.
If you are lucky, you will need to pay 20€ for the membership and enjoy one of the best cannabis clubs in Barcelona.