You must know the Merchant ID (MID) of the merchant to do this.
For example, you may form a partnership with ESG companies to reward your cardholders for recycling. You want to limit purchases on the card to only the ESG companies you have partnered with.
If you want to do this, please have your partners provide you with their MIDs, and then open a support ticket on the Hydrogen portal to provide the MIDs to us. For security reasons, we need to manually provision this in the API on your behalf. If your partner is unsure of their MID, we have included guides from popular platforms below: