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Understanding Payment Gateway Errors and Fixes

- Payment Gateway Error Codes - Interpreting and Resolving Them

Read the numeric code first – it tells you exactly why the request failed. A 401 response points to missing or incorrect credentials; a 502 signals a temporary upstream problem that usually resolves after a short pause.

Link each code to a specific corrective step: validate API keys for authentication errors, clean the JSON payload for 400‑series client issues, and apply exponential back‑off for 5xx server responses. Capture the full error payload, including timestamps, to speed up the diagnosis.

for authentication errors, clean the JSON payload for 400‑series client issues, and apply exponential back‑off for 5xx server responses. Capture the full error payload, including timestamps, to speed up the diagnosis.">

Gateway‑specific codes often appear alongside standard HTTP numbers. Code 1001 means "invalid card number," 1002 indicates "insufficient funds," and 1003 denotes "card expired." When these appear, double‑check the card data, confirm the available balance, or ask the user for an updated expiry date before retrying.

Set up monitoring alerts that fire after a series of failures. Define thresholds for authentication, formatting, and connectivity problems so you can intervene before the checkout flow is disrupted.