Basically, the website allows one to schedule a kayak rental online via CheckFront scheduling software. When they choose the kayak they want to rent, they need to get automatically sent via SMS a PIN code for the lock. This is what the API connection needs to allow.
I will provide you details on chat.
If you have any experience in working with CheckFront will be highly recommended.
If you read my description, please bid with 'Kayak' words on your proposal with that evidence.
Maximum budget $50