Standard error codes:
| Error | Meaning |
| unspecified | The error type is not specified. See details in the message. |
| invalid_api_key | The specified API access key is invalid. Check whether the value of api_key matches the value specified in your account. |
| access_denied | Access is denied. Check whether access to API is enabled in your personal account and whether you are calling a method you do not have access rights to. |
| unknown_method | The specified method name is incorrect. |
| invalid_arg | An invalid value was specified for one of the method arguments. |
| not_enough_money | You do not have enough money on your account to execute the method. |
| retry_later | Temporary failure. Try again later. |
| api_call_limit_exceeded_for_api_key | The restriction on the number of calls of API methods per unit of time was actuated. At the moment, it is 1200 calls per minute. For the sendEmail method, it is 60 calls. |
| api_call_limit_exceeded_for_ip | The restriction on the number of calls of API methods per unit of time was actuated. At the moment, it is 1200 calls per minute. For the sendEmail method, it is 60 calls. |
Frequent errors without indication of the type:
| Error | Meaning |
| "These list ids="..." has no confirmation letters" | No confirmation email has been created for the list to which the recipient subscribes. Open the list of contacts for which the subscription is set in your personal account, there is an item «Subscribe and unsubscribe tools» in the bottom left corner. Fill in all the fields on this page and save. Instructions for creating a confirmation letter. |
| “Contacts test@example.org and +77777777 already exist but owned by different subscribers” | You add email and phone number of the contact, which is already present in your personal account. Indicate an email or phone number that does not belong to another recipient. |
| "Call to a member function getMessage() on boolean" | The call is made with simultaneous use of the GET and POST methods. Make the request using only one of these methods. |
In addition to these errors, there may be other ones specified in the descriptions of the methods. Error codes are unique to the entire API, regardless of the method.
Example of a response with an error:
{"error":"AK100310-02","code":"invalid_api_key"}