The credencial

The credencial is the pilgrims' 'passport' on the Way, a 14-page, accordion-pleated document, obtainable in advance or during the pilgrimage (see list here). Besides some of the pilgrims' personal details, it provides space for collecting stamps.

Pilgrims also have to keep to the rules listed in the credencial.

Collecting the stamps of albergues and refugios in one's credencial is necessary to prove one has accomplised the pilgrimage and so can obtain the fisterrana.