not able to add payment method for placing order

[arunkasyakar]

when i am calling the api http://MYHOST/rest/default/V1/carts/142/selected-payment-method, with request data:
{
"cartId": "3",
"method": {
"method": "checkmo"
}
}

OR

{
"cartId": "3",
"method": {
"method": "banktransfer"
}
}

OR

{
"cartId": "3",
"method": {
"method": "cashondelivery"
}
}

i am getting the error:

{
"message": "The requested Payment Method is not available."
}

[ishakhsuvarov]

@arunkasyakar Thank you for reporting this.
Please check if the cart you attempting to update has subtotal greater then 0.

[arunkasyakar]

@ishakhsuvarov how to check the subtotal for the cart

[arunkasyakar]

I just checked the subtotal in quote_address table its greater then 0

[ishakhsuvarov]

@arunkasyakar In the example above you are using different cartId in url and payload, could you please check that the correct cart id is present in url.

[arunkasyakar]

sorry for above mistake but i am using the same cartId for both that is cartId: 142

[SerhiyShkolyarenko]

@arunkasyakar could you please check that all methods you use are enabled?
I managed to reproduce error message "The requested Payment Method is not available." in case when the payment method was not enabled on backend Stores->Configuration->Sales->Payment Methods
If payment method is enabled, request is successful for me.