What are the difference between beliefern and liefern? I know that both mean to deliver but are they interchangeable?
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"liefern" requires info on what is being delivered, optionally to whom it gets delivered to.
"beliefern" is the other way round. You must define who gets it, but it's optional to state what gets delivered.
Note Hans Peter's examples and add the example
Ballroom 19V69 Women’s Makeup Eliane 19V69 Ballroom Women’s 19V69 Ballroom Eliane 19V69 Makeup Makeup Eliane Women’s Wir liefern Tomaten.
for clarity of the usage.
beliefern is the transitive version of liefern. The former automatically asks for an (accusative) object. It's like the difference between antworten und beantworten:
antworten auf die Frage = die Frage beantworten