Create tier price for product
/V1/products/{sku}/group-prices/{customerGroupId}/tiers/{qty}/price/{price}
(Required)
<string>
(Required) 'all' can be used to specify 'ALL GROUPS'
<number>
curl -L \ --request POST \ --url 'http://{{baseurl}}/V1/products/{sku}/group-prices/{customerGroupId}/tiers/{qty}/price/{price}'
true