Connect to your Stancer account then copy/paste your API keys in the configuration of your Dolibarr plugin:

Copy your API keys from your Stancer account …

… then paste them in the Dolibarr module configuration

Warning, this module is based on data normally existing in Dolibarr but which may have been modified: codes cb_et_pre_dans_le_dictionnaire_des_moyens_de_paiements .