BadRequest will return `http.StatusBadRequest` with custom message.

Conflict will return `http.StatusConflict` with custom message.

Errorf github.com/pkg/errors wraper Errorf formats according to a format specifier and returns the string as a value that satisfies error.

Forbidden will return `http.StatusForbidden` with custom message.

Gone will return `http.StatusGone` with custom message.

InternalServer will return `http.StatusInternalServerError` with custom message.

InternalServerStd will return `http.StatusInternalServerError` with static message.

InvalidKey returns new error with custom error message.

KeyRequired returns new error with custom error message.

New github.com/pkg/errors wraper New returns an error with the supplied message.

NewAppError returns the new apperror object.

NotFound will return `http.StatusNotFound` with custom message.

PaymentRequired will return `http.StatusPaymentRequired` with custom message.

TooEarly will return `http.StatusTooEarly` with custom message.

TooManyRequests will return `http.StatusTooManyRequests` with custom message.

Unauthorized will return `http.StatusUnauthorized` with custom message.

UnprocessableEntity will return `http.StatusUnprocessableEntity` with custom message.

Wrap github.com/pkg/errors.Wrap Wrap returns an error annotating err with a stack trace at the point Wrap is called, and the supplied message.

Wrapf github.com/pkg/errors.Wrapf Wrapf returns an error annotating err with a stack trace at the point Wrapf is called, and the format specifier.

MaxStackTraceLimit allows to print only max 5 frames.

All the defined Internal ErrorCodes.

AppError struct holds the value of HTTP status code and custom error message.

Details struct contains the application logic specific internal error codes, readable message and a link to a support doc.

ErrorCode is a enum type where all the platform error codes are defined.