Error Codes and Troubleshooting | Visa Click to Pay API | Visa Developer Center

Visa Click to Pay

Merchants and Payment Service Providers

Error Codes and Troubleshooting

Overview

The Click to Pay API uses standardized HTTP status codes and structured error responses to communicate issues during API processing.

Error Response Structure

All Click to Pay API error responses follow a consistent structure:

Response Fields:

status: HTTP status code (400, 401, 403, 404, 500, etc.)
reason: High-level error category
message: General error description for developers
errorDetail: Array of specific error details

Common Error Scenarios

The most frequently encountered error scenarios in Click to Pay API integrations:


Authentication Failures	Invalid or expired tokens, missing API keys, or incorrect credentials
Validation Errors	Invalid request data, missing required fields, or format violations
Business Logic Errors	Consumer not found, card enrollment failures, or transaction confirmation issues
System Errors	Temporary service unavailability, timeout issues, or internal processing failures

Debugging and Troubleshooting

When encountering errors, follow this systematic approach:

Examine HTTP Status Code: Determine the error category
Review Error Details: Check specific error reasons and sources
Validate Request Data: Ensure all required fields and formats are correct
Check Authentication: Verify token and API key validity
Review API Documentation: Confirm endpoint requirements and constraints
Test in Sandbox: Reproduce issues in the sandbox environment
Monitor Patterns: Look for recurring error patterns or trends

HTTP Status Codes

Success Status Codes (2xx)

Successful request processing with various completion states:

Code	Status	Meaning	Click to Pay API Usage
200	OK	Request processed successfully	Standard success response for most API operations
202	Accepted	Request accepted for processing but not yet complete	Card enrollment pending validation, identity validation in progress

Client Error Status Codes (4xx)

Errors caused by client request issues:

Code	Status	Common Causes	Resolution Actions
400	Bad Request	Invalid request format, missing required fields, validation failures	Review request structure, validate all required fields, check data formats
401	Unauthorized	Invalid token, expired token, missing authentication	Refresh token, verify API key, check authentication headers
403	Forbidden	Valid credentials but insufficient permissions	Verify client permissions, check SRC role configuration, contact support
404	Not Found	Consumer not found, invalid endpoint, resource doesn't exist	Verify consumer's identity, check endpoint URL, handle as business logic
405	Method Not Allowed	Incorrect HTTP method for endpoint	Use correct HTTP method (GET, POST) as specified in API documentation
409	Conflict	Consumer already exists, duplicate enrollment attempt	Check existing consumer status, use appropriate flow for existing consumers
422	Unprocessable Entity	Valid format but business logic validation failed	Review business rules, check data relationships, validate card information
429	Too Many Requests	Rate limit exceeded	Implement exponential backoff, respect Retry-After header, reduce request rate

Server Error Status Codes (5xx)

Errors caused by server-side processing issues:

Code	Status	Common Causes	Resolution Actions
500	Internal Server Error	Unexpected server processing error	Retry with exponential backoff, contact support if persistent
502	Bad Gateway	Upstream service failure, network connectivity issues	Retry request, check service status, implement circuit breaker pattern
503	Service Unavailable	Temporary service overload, maintenance mode	Retry with exponential backoff, check service status page
504	Gateway Timeout	Request timeout, slow upstream processing	Retry with longer timeout, implement async processing if possible

Status Code Handling by Endpoint

Different endpoints may return specific status codes based on their functionality:

Endpoint	Success Codes	Common Error Codes
POST /identities/lookup	200	400 (invalid identity), 401 (auth failure), 404 (consumer not found)
POST /cards	200, 202	400 (invalid card data), 409 (consumer exists), 422 (enrollment failed)
POST /transaction/credentials	200	400 (invalid request), 404 (card not found), 422 (transaction failed)
GET /transaction/credentials	200	400 (missing parameters), 404 (card not found), 401 (auth failure)
POST /profiles/prepare	200	400 (invalid identity), 404 (profile not found), 403 (access denied)
POST /confirmations	200	400 (invalid confirmation data), 404 (transaction not found)
POST /identities/validation/initiate	200	400 (invalid request), 404 (consumer not found), 422 (validation unavailable)
POST /identities/validation/complete	200, 202	400 (invalid validation data), 422 (validation failed), 404 (session not found)

Error Response Patterns

Understanding common error response patterns helps with debugging:

Authentication Errors (401):

Always check both token and API key
Token expiration is the most common cause
Implement automatic token refresh

Validation Errors (400):

Review errorDetail array for specific field issues
Check required field presence and format
Validate data types and constraints

Business Logic Errors (404, 409, 422):

Handle as expected business scenarios
Implement appropriate user flows
Do not retry these errors

Server Errors (5xx):

Implement retry logic with exponential backoff
Monitor error rates and patterns
Set up alerting for persistent issues

Retry Logic Implementation

Recommended retry strategies for different status codes:

Immediate Retry (No Delay):

None - always implement some delay to avoid overwhelming the service

Exponential Backoff Retry:

500, 502, 503, 504 - Server errors
429 - Rate limiting (respect Retry-After header)

Limited Retry:

401 - Authentication (refresh token once, then fail)

No Retry:

400, 403, 404, 405, 409, 422 - Client errors

Monitoring and Alerting

Set up monitoring for different status code patterns:

Critical Alerts:

High rate of 5xx errors (>5% of requests)
Authentication failures spike (401 errors)
Complete service unavailability (503 errors)

Warning Alerts:

Increased 4xx error rates
Rate limiting occurrences (429 errors)
Business logic error patterns

Informational Monitoring:

Success rate trends
Response time by status code
Error distribution patterns

Troubleshooting Checklist

Systematic approach to diagnosing status code issues:

For 4xx Errors:

Validate request format and required fields
Check authentication credentials and headers
Verify API endpoint and HTTP method
Review business logic and data relationships
Test with known good data in sandbox

For 5xx Errors:

Check Click to Pay API service status
Verify network connectivity
Review request timing and size
Implement retry logic if not present
Contact support for persistent issues