Offline Validations

Evergiving fundraiser forms uses many different types of validation on various pieces of data entered into the form. However, some validations are only possible when the tablet/form has access to the internet because they validate data using online services. Where possible we will validate everything that can be validated offline. Some examples of offline validations include:
- Final digit of card number Luhn algorithm
- Phone number prefix/length
- Email pattern (presence of @ and domain)

Some examples of checks that can only take place when the form is online include:
- Lookup of card information (brand, type, issuing bank, level)
- Autocomplete/validation of postal addresses
- Reliability score of email address (does the email look real)

IBAN Offline Validation

If Online:

IBAN will be checked against the EISCD database of valid IBAN's :
If Valid -> Continue with pledge
If Invalid -> Prompt invalid entry exclude, prompt retry. Log all activity

If Offline

IBAN will be checked against local logic and use modulas checking :
If Validated by local logic, Continue
If outside of logic range: Double entry on conditional acceptance.

Once Online:

Offline validation by local logic will be passed through the EISCD database for counter-validation
If found to be invalid -> discard and log failed pledge
Conditionally accepted pledges will face same validation once online