For individual clients: Please send your inquiry to support@payswix.com from your registered email address and we will do the rest.For business clients: to change your mobile number or email address, please send us (support@payswix.com) an official free-form letter with your request. The letter should include the old and the new phone numbers and/or emails and be signed by the director of the company. Once the letter is received, we will do the rest.