BDT (৳), Bangladeshi taka
Paying online means a mobile wallet, overwhelmingly bKash, then Nagad, then Rocket, funded by cash-in at a neighbourhood agent or by bank transfer. Cards are a minority urban instrument and cash on delivery is still how a large share of e-commerce orders are actually settled nationally, much less so in Dhaka than outside it.
Cards: Partly, and never as the primary plan. Cards are a minority instrument and credit cards especially so, concentrated in higher-income urban segments. Domestically issued Visa and Mastercard debit cards do work online through licensed local gateways. Cross-border is the hard part: the taka is not freely convertible under the Foreign Exchange Regulation Act 1947, a resident paying a foreign merchant needs foreign currency endorsed against a passport travel quota and banks collect an authorisation form for foreign payments, so a foreign-billed USD checkout should expect a high proportion of Bangladeshi card attempts to simply fail.
Regulator: Bangladesh Bank, through its Payment Systems Department, under the Payment and Settlement Systems Act 2024. No entity may operate a payment system or provide payment services without a Bangladesh Bank licence; the categories that matter commercially are MFS, PSP and PSO. Offences under the Act are cognizable and non-bailable.