Odaily Planet Daily News: Nigerian cryptocurrency trading platform Bitmama has temporarily suspended its virtual Mastercard service due to unforeseen problems with its provider. African fintech companies are currently facing card service challenges, including exchange rate fluctuations, chargeback fraud and insufficient funds. Some fintech companies blame provider problems, while others cite high costs and limited revenue opportunities. Despite these obstacles, some fintech companies such as Bitmama and Chipper Cash continue to provide alternative card services. (Bitcoin.com)