Visa has formed a strategic partnership with Stripe in addition to backing a series D round, raised at a $5bn valuation, that included American Express.

Payment services firm Visa provided an undisclosed amount of funding for US-based mobile payment technology provider Stripe yesterday as part of a strategic partnership.

Stripe supplied the money as part of a larger series D round that included another payment services provider, American Express, as well as Sequoia Capital and General Catalyst Partners, according to Fortune, adding that Stripe raised the money at a $5bn valuation.

Founded in 2011, Stripe has developed an easy-to-use payment processing platform for online merchants.…