Hi Max
"green" is to let "Initial-Current" to flow to the Credit-Relay - it pulls-in and
"orange is established Self-Hold-Current of the Credit-Relay".
The pulling Credit-Relay "encircled-red Switch" allows Initial-Current to flow "red" to Coil on Coin-Relay" it pulls-in and
"blue" is the Self-Hold-Circuitry of the Coin-Relay.
When You use the "First Coin Chute": "Straight upwards another form of "Initial-Current to Coin-Relay. Greetings Rolf