RB_FIELD_[FIELD_ID]where “[FIELD_ID]” is replaced with the ID of the custom field. The custom field ID is generated as name of the custom field in SNAKE_CASING. The value of the custom field would be set as the value in the parameter. For example, if you are collecting the blood types of contacts and a contact has blood type AB positive, you would send the parameter
RB_FIELD_BLOODTYPEwith the value of
RB_FIELD_PHONEcan be used to update the value of a contact's phone number.
RB_REMOVEFIELDS. The value would be the names of the fields you want to remove. You have the option of clearing several fields at once by separating them with commas.