When a request fails, Meld endpoints return a response that includes the errors fields in the body. The following table lists the error code you might receive from our API.

The error message includes both Meld's error code and the service provider's error details. Reference Error schema.

General

Error code	Error message
`UNKNOWN`	Unknown Error
`BAD_REQUEST`	Bad request Note:* When a bad request is received, the system will return a user-friendly representation of the error, such as: [amount] Must be a decimal value greater than zero [serviceProvider] Must be a service provider [serviceTransactionId] must not be blank

Error code

Error message

UNKNOWN

Unknown Error

BAD_REQUEST

Bad request

*Note:** When a bad request is received, the system will return a user-friendly representation of the error, such as:
[amount] Must be a decimal value greater than zero
[serviceProvider] Must be a service provider
[serviceTransactionId] must not be blank

Payments

Error code	Error message
`INVALID_AMOUNT_OR_CURRENCY`	Invalid amount or currency
`INITIAL_TRANSACTION_ERROR`	Error creating initial transaction
`JSON_PROCESSING_ERROR`	Error processing JSON
`PAYMENT_TRANSACTION_STATE_INVALID`	Payment transaction is null or invalid
`PREVIOUS_TRANSACTION_STATE_INVALID`	Previous transaction state is null or invalid
`SERVICE_PROVIDER_ERROR`	Service Provider Error
`TRANSACTION_CREATION_ERROR`	Unable to create transaction
`TRANSACTION_EXCEPTION`	Exception in transaction
`TRANSACTION_INVALID_ID`	Transaction ID is invalid or it was not found
`TRANSACTION_INVALID_STATE_ID`	Transaction state ID is invalid or it was not found
`TRANSACTION_NO_RESULT`	No result from gateway
`TRANSACTION_NO_RESPONSE`	No response from transaction
`TRANSACTION_REQUEST_CREATION_ERROR`	Unable to create a transaction request
`TRANSACTION_INVALID_PROVIDER`	Invalid service provider
`TRANSACTION_UPDATE_NULL_ERROR`	Unable to update a null/invalid transaction
`TRANSACTION_INVALID_SERVICE_TRANSACTION_ID`	Invalid service transaction ID
`TRANSACTION_NULL_DATA`	Transaction data is null
`NOT_SUPPORTED`	Operation not supported for service provider
`FAILED_GETTING_TRANSACTION`	Failed getting transaction
`TRANSACTION_MISSING_SERVICE_PROVIDER_DETAILS`	Request requires serviceProviderDetails property
`TRANSACTION_MISSING_CARD_INFORMATION`	Missing credit/debit card information
`TRANSACTION_FAILED_GETTING_CRYPTO_QUOTE`	Failed getting crypto quote
`TRANSACTION_CREDIT_CARD_INFO_NOT_SUPPORTED`	Transactions with credit card information are not supported by the provider. Try to use nonces