MainstreamOn this page
India
Pay-in by UPI: the hosted page shows a QR code, Paytm and PhonePe buttons and the UPI ID, and a host-to-host integration gets a direct app link. Pay-out by IMPS bank transfer, in INR.
- UPI
- PhonePe
- Paytm
- IMPS pay-outs
- INR
India · Bangladesh
Local payments in India and Bangladesh for high‑risk businesses
Pay-in through UPI, bKash and Nagad, pay-out through IMPS, bKash and Nagad, for iGaming and betting. A hosted payment page, a merchant API and signed webhooks.
- UPI
- PhonePe
- Paytm
- bKash
- Nagad
- INR
- BDT
- USDT
DelhiKolkataMumbaiBengaluru
DhakaChattogram
IndiaUPI · PhonePe · Paytm · INR
BangladeshbKash · Nagad · BDT
What you get
One integration, two markets and a clear view of every payment.
Merchant dashboard
Conversion, pay-in and pay-out volumes, appeals and the balance of every MID for any period, with your full list of payments and USDT top-ups and withdrawals.
Signed webhooks
Every final status reaches your callback URL, signed with HMAC-SHA256 and retried on a schedule if your server is down.
Appeals
Dispute the amount of a finished payment through the API. The disputed difference is held until the appeal is resolved.
Documented API
An OpenAPI reference for pay-ins, pay-outs, appeals and callbacks, shared when you connect.
Coverage
Two markets, each connected end to end: local methods for pay-ins, local rails for pay-outs.
Bangladesh
Pay-in and pay-out through bKash and Nagad mobile wallets, in BDT.
- bKash
- Nagad
- BDT
Each MID keeps its balance in USDT or in the local currency. Top-ups and withdrawals are made in USDT.
How to connect
Onboarding is personal: a manager agrees the terms with you and issues your access.
Message us
On Telegram or by email: your vertical, target countries and expected volume.
Agree the terms
Fees and limits are set individually for each method.
Get access
Dashboard access, an API secret, a webhook secret and the API documentation.
Integrate
The hosted payment page or host-to-host, with webhooks on your side.
Go live
Your first payments with a manager on the line.
For developers
- A REST API authenticated with the
X-API-SECRETheader - A hosted payment page in English and Bengali
- Webhooks signed with HMAC-SHA256 in the
X-Webhook-Signatureheader - An OpenAPI reference, shared when you connect
# Create a pay-in on the hosted payment page (India)
curl -X POST \
https://api.mainstream.global/api/integrations/merchant/payments/INDIA/payment-page/pay-in/UPI_QUASI_IMPS \
-H "X-API-SECRET: $API_SECRET" \
-H "Content-Type: application/json" \
-d '{
"mid_id": "<your MID id>",
"transaction_id": "order-1042",
"customer_reference": "customer-77",
"money": { "amount": "4500.00", "currency": "INR" },
"callback_url": "https://shop.example/callbacks",
"redirect_url": "https://shop.example/return",
"support_url": "https://shop.example/support"
}'
# The response carries payment_page_url: send your customer there.
# Webhooks arrive signed:
# X-Webhook-Signature: t=1761091200,v1=<hex HMAC-SHA256>FAQ
Short answers. Anything commercial is agreed with a manager.
Which countries do you cover?
India: UPI with Paytm and PhonePe, and IMPS for pay-outs. Bangladesh: bKash and Nagad. We add a market only once it is live.
Which businesses do you work with?
iGaming and betting. Tell us your vertical in your first message.
What are the fees?
They are set individually for each merchant and method. There is no public price list.
How long does integration take?
The hosted payment page needs one API call per payment. A host-to-host integration depends on your side; you get the documentation together with access.
Which currency is my balance in?
Each MID keeps its balance in USDT or in the local currency. Top-ups and withdrawals are made in USDT.
Can I register on my own?
No. A manager issues your access once the terms are agreed.
Talk to a manager
One message is enough: your vertical, target countries, expected volume and how you want to integrate. We reply within one business day.
These are the only official contacts. We never write first.