Oct 2026 Technical
Successful transaction, unpaid order | Paymos
A successful crypto transaction can leave an order unpaid. Check the actual token transfer, recipient, amount, network, invoice match, and confirmations.
4 min read
Technical
Technical explanations of networks, gas, confirmations, APIs, webhooks, security, and reliable crypto payment operations.
Sep 2026 Technical
Crypto Payment Fraud: 7 Attacks Before Fulfilment
Seven ways a crypto payment gets faked before the order ships, each named with the control that stops it and the point where that control runs out.
14 min read
Sep 2026 Technical
Double-Entry Ledger for a Crypto Payment Processor
Money and orders move at different moments. How a crypto payment processor records that in a double-entry ledger, and what one running total cannot say.
10 min read
Sep 2026 Technical
Crypto Withdrawal Speed: Where the Wait Comes From
A crypto withdrawal has two halves: the one sent the moment you ask, and the one the chain decides. Why no settlement time is published for either.
13 min read
Sep 2026 Technical
Hot Wallet Security in Crypto Payment Processing
Isolated signing, scoped keys, a destination whitelist, freezes. What each control on a crypto payout path stops, and where each one runs out.
15 min read
Sep 2026 Technical
Crypto Invoice Overpaid or Underpaid: What Happens
An overpaid crypto invoice closes as paid and reports invoice.paid_over. What underpayment tolerance absorbs, and what a short payment leaves you holding.
10 min read
Sep 2026 Technical
Webhook Idempotency: Why Payment Events Repeat
Webhook delivery is at-least-once by design. Why the same event arrives twice, what the outbox pattern does not fix, and which id a receiver deduplicates on.
11 min read
Sep 2026 Technical
Webhook SSRF: Callback URLs into Private Networks
Webhook SSRF turns your delivery worker into an HTTP client someone else aims. Why string filters fail, and which address ranges a check has to refuse.
12 min read
Aug 2026 Technical
Blockchain Reorgs: Can a Confirmed Payment Vanish?
A reorg can orphan a block a payment was mined in. What that does to an order you already shipped, who absorbs the loss, and how to test it first.
7 min read
Aug 2026 Technical
Why Your Payment Plugin Should Have No API Keys
A Paymos plugin archive is the same file for every merchant and holds no API key, secret, project ID, or webhook secret. Why that is, and how to check.
11 min read
Jul 2026 Technical
Crypto Invoicing: The Payment Lifecycle Guide
Crypto invoicing explained from order ID and checkout to confirmation, underpayment, signed webhooks, reconciliation, and safe order fulfillment.
7 min read
Jul 2026 Technical
USDT TRC20 vs ERC20 vs BEP20: Payment Network Guide
Compare USDT TRC20, ERC20, and BEP20 payment routes by chain, fee asset, wallet compatibility, Paymos support, confirmation, and checkout risk.
7 min read
Jun 2026 Technical
Crypto Confirmation Policy: Why the Wait Varies
Paymos sets confirmation depth per network and per amount band. See the tiers, why the derived times stay approximate, and what merchant code should read.
7 min read
May 2026 Technical
Crypto Payments REST API: A Production-Ready Guide
Build a crypto payment API integration with HMAC authentication, retry-safe invoices, signed webhooks, sandbox testing, and order reconciliation.
6 min read
Mar 2026 Technical
Tron vs Ethereum Fees: Which Network for USDT?
Compare Tron and Ethereum fee mechanics for USDT without stale price claims. Learn what the payer, wallet, network, and merchant each need to check.
5 min read
Mar 2026 Technical
Blockchain Confirmations and Finality Explained
Blockchain confirmations and finality explained: what they prove, how long to wait, and why network, amount, and current conditions change the answer.
6 min read
Dec 2025 Technical
Crypto Gas Fees Explained: Why Network Costs Change
Crypto gas is the sender-paid cost of getting a transfer into a block. Learn how demand, execution, staking, and network design change the fee.
8 min read